NEET MODEL BIOLOGY 2 - Knowledge Vibes

Q1)Independent assortment of genes does not take place when:

Genes are located on homologous chromes

Genes are linked and located on the same Chromosome.

Genes are located on non-homologous chromosome

All the above

Correct! Wrong!

Q2)There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome?

b, a, c

a, b, c

a, c, b

None

Correct! Wrong!

Q3)A plant of F1-generation has genotype “AABbCc”. On selfing of this plant what is the phenotypic ratio in F2-generation:

3 : 1

1 : 1

9 : 3 : 3 : 1

27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

Correct! Wrong!

Q4)A diseased man marries a normal woman. They get three daughter and five sons. All the daughters were diseased and sons were normal. The gene of this disease is:

Sex-linked dominant

Sex-linked recessive

Sex-limited character

Autosomal dominant

Correct! Wrong!

Q5)A gene is said to be dominant if:

It expresses its effect only in homozygous stage

It is expressed only in heterozygous condition

It is expressed both in homozygous and in heterozygous condition

It is never expressed in any condition

Correct! Wrong!

Q6)Which of the following is the example of pleiotropic gene?

Hemophilia

Thalassemia

Sickle cell anemia

Colour blindness

Correct! Wrong!

Q7)Which of the following is the example of sexlinked disease?

AIDS

Colour blindness

Syphilis

Gonorrhoea

Correct! Wrong!

Q8)Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?

100%

75%

50%

25%

Correct! Wrong!

Q9)Pattern baldness, moustaches and beard in human males are examples of:

Sex-linked traits

Sex-limited traits

Sex-differentiating traits

Sex-determining traits

Correct! Wrong!

Q10)Christmas disease is another name for:

Hemophilia B

Hepatitis B

Down’s syndrome

Sleeping sickness

Correct! Wrong!

Q11)The linkage map of X-chromosome of fruit fly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two (y and b) should be:

60%

>50%

50%

100% 20.

Correct! Wrong!

Q12)Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross is known as:

Test cross

Reciprocal cross

Dihybrid cross

Reverse cross

Correct! Wrong!

Q13)The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes:

Seven

Six

Five

Four

Correct! Wrong!

Q14)Which one of the following traits of garden pea studied by Mendel was a recessive feature?

Axial flower position

Green seed colour

Green pod colour

Round seed shape

Correct! Wrong!

Q15)Nicotiana sylvestris flowers only during long days and Nicotiana tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be crossfertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species:

They cannot interbreed in nature

They are reproductively distinct

They are physiologically distinct

They are morphologically distinct

Correct! Wrong!

Q16)Genes for cytoplasmic male sterility in plants are generally located in:

Chloroplast genome

Mitochondrial genome

Nuclear genome

Cytosol

Correct! Wrong!

Q17)After a mutation at a genetic locus the character of an organism changes due to the change in:

DNA replication

Protein synthesis pattern

R transcription pattern

Protein structure

Correct! Wrong!

Q18)A self-fertilizing trihybrid plant forms:

4 different gametes and 16 different zygotes

8 different gametes and 16 different zygotes

8 different gametes and 32 different zygotes

8 different gametes and 64 different zygotes

Correct! Wrong!

Q19)One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in:

None of the progenies

All the progenies

50% of the progenies

1/3 of the progenies

Correct! Wrong!

Q20)A normal woman, whose father was colour blind is married to a normal man. The sons would be:

50% colour blind

All normal

All colour blind

75% colour blind

Correct! Wrong!

Q21)A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh?

1/32

1/16

1/4

1/8

Correct! Wrong!

Q22)The recessive genes located on Xchromosomes in humans are always:

Sub-lethal

Expressed in males

Expressed in females

Lethal

Correct! Wrong!

Q23)Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to:

Recombination

Linkage

Crossing over

Repulsion

Correct! Wrong!

Q24)A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:

Turner syndrome

Down syndrome

Super femaleness

Triploidy

Correct! Wrong!

Q25)Haemophilia is more commonly seen in human males than in human females because:

This disease is due to a Y-linked recessive mutation

This disease is due to an X-linked recessive mutation

This disease is due to an X-linked dominant mutation

A greater proportion of girls die in infancy

Correct! Wrong!

Q26)Which of the following is not a hereditary disease?

Hemophilia

Cretinism

Cystic fibrosis

Thalassemia

Correct! Wrong!

Q27)A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy:

Must have normal colour vision

May be colour blind or may be normal vision

Will be partially colour blind since he is heterozygous for the colour blind mutant allele

Must be colour blind

Correct! Wrong!

Q28)G-6-P dehydrogenase deficiency is associated with hemolysis of:

Leucocytes

Lymphocytes

Platelets

YRBCs

Correct! Wrong!

Q29)The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because:

They have endoreduplicated chromosomes

These are fused

These are easy to stain

These are much longer in size

Correct! Wrong!

Q30)At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

0.2

0.16

0.48

0.36

Correct! Wrong!

Q31)In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be crossed to a plant with the genotype:

AaBb

aabb

AABB

aaBB

Correct! Wrong!

Q32)How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

Three

Four

Nine

Two

Correct! Wrong!

Q33)Phenotype of an organism is the result of

Mutations and linkages

Cytoplasmic effects and nutrition

Environmental changes and sexual dimorphism

Genotype and environment interactions

Correct! Wrong!

Q34)Test cross involves:

Crossing between two genotypes with recessive trait

Crossing between two F1 hybrids

Grossing the F1 hybrid with a double recessive genotype

Crossing between two genotypes wit dominant trait

Correct! Wrong!

Q35)In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

Only round seeds with green cotyledons

Only wrinkled seeds with yellow cotyledons

Only wrinkled seeds with green cotyledons

Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons

Correct! Wrong!

Q36)Sickle cell anemia has not been eliminated from the African population because:

It is controlled by recessive genes

is not a fatal disease

It provides immunity against malaria

It is controlled by dominant genes

Correct! Wrong!

Q37)Both sickle cell anemia and Huntington's chorea are:

Bacteria-related diseases

Congenital disorders

Pollutant-induced disorders

Virus-related diseases

Correct! Wrong!

Q38)Cri-du-chat syndrome in humans is caused by the:

Fertilization of an XX egg by a normal Y bearing sperm

Loss of half of the short arm of chromosome5

Loss of half of the long arm of chromosome 5

Trisomy of 21st chromosome

Correct! Wrong!

Q39)Which one of the following is an example of polygenic inheritance?

Flower colour in Mirabilis jalapa

Production of male honey bee

Pod shape in garden pea

Skin colour in humans

Correct! Wrong!

Q40)If a colour blind woman marries a normal visioned man, their sons will be:

All normal visioned

One-half colour blind and one-half normal

Three-fourths colour blind and one-fourth normal

All Colour blind

Correct! Wrong!

Q41)A human male produces sperms with the geno-types AB, Ab, AB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

AABB

AaBb

AaBB

AABb

Correct! Wrong!

Q42)Inheritance of skin colour in humans is an - example of:

Codominance

Chromosomal aberration

Point mutation

Polygenic inheritance

Correct! Wrong!

Q43)The two polynucleotide chains in DNA are:

Semiconservative

Parallel

Continuous

Antiparallel

Correct! Wrong!

Q44)In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

3: 1

50:50

9: 1

1:3

Correct! Wrong!

Q45)Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F2 segration will show:

Higher number of the parental types

Higher number of the recombinant types

Segregation in the expected 9: 3: 3: 1 ratio

Segregation in 3: 1 ratio

Correct! Wrong!

Q46)A common test to find the genotype of a hybrid is by:

Crossing of one F1 progeny with male parent

Crossing of one F2 progeny with male parent

Crossing of one F2 progeny with female parent

Studying the sexual behavior of F1 progenies.

Correct! Wrong!

Q47)Which one of the following condition in humans is correctly matched with its chromosomal abnormality/linkage?

Erythroblastosis foetalis - X-linked

Down syndrome - 44 autosomes + XO

Klinefelter’s syndrome - 44 autosomes+ XXY

Colour blindness - Y-linked

Correct! Wrong!

Q48)Point mutation involves:

Deletion

Insertion

Change in single base pair

Duplication

Correct! Wrong!

Q49)Select he incorrect statement from the following

Baldness is a sex limited trait

Linkage is an exception to the principle of independent assortment in heredity.

Galactosemia is an inborn error metabolism

Small population size results in random genetic drift in a population

Correct! Wrong!

Q50) Sickle cell anemia is:

Characterized by elongated sickle like RBCs with a nucleus

An autosomal linked dominant trait

Caused by substitute of valine by Glutamic acid in the beta globin chain of Hemoglobin.

Caused by a change in a single base pair of DNA

Correct! Wrong!

NEET MODEL BIOLOGY 2

GRADE A

GRADE B

GRADE C

GRADE D

Q1)Independent assortment of genes does not take place when:

Q2)There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome?

Q3)A plant of F1-generation has genotype “AABbCc”. On selfing of this plant what is the phenotypic ratio in F2-generation:

Q4)A diseased man marries a normal woman. They get three daughter and five sons. All the daughters were diseased and sons were normal. The gene of this disease is:

Q5)A gene is said to be dominant if:

Q6)Which of the following is the example of pleiotropic gene?

Q7)Which of the following is the example of sexlinked disease?

Q8)Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?

Q9)Pattern baldness, moustaches and beard in human males are examples of:

Q10)Christmas disease is another name for:

Q11)The linkage map of X-chromosome of fruit fly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two (y and b) should be:

Q12)Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross is known as:

Q13)The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes:

Q14)Which one of the following traits of garden pea studied by Mendel was a recessive feature?

Q16)Genes for cytoplasmic male sterility in plants are generally located in:

Q17)After a mutation at a genetic locus the character of an organism changes due to the change in:

Q18)A self-fertilizing trihybrid plant forms:

Q19)One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in:

Q20)A normal woman, whose father was colour blind is married to a normal man. The sons would be:

Q21)A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh?

Q22)The recessive genes located on Xchromosomes in humans are always:

Q23)Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to:

Q24)A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:

Q25)Haemophilia is more commonly seen in human males than in human females because:

Q26)Which of the following is not a hereditary disease?

Q27)A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy:

Q28)G-6-P dehydrogenase deficiency is associated with hemolysis of:

Q29)The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because:

Q30)At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

Q31)In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be crossed to a plant with the genotype:

Q32)How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

Q33)Phenotype of an organism is the result of

Q34)Test cross involves:

Q35)In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

Q36)Sickle cell anemia has not been eliminated from the African population because:

Q37)Both sickle cell anemia and Huntington's chorea are:

Q38)Cri-du-chat syndrome in humans is caused by the:

Q39)Which one of the following is an example of polygenic inheritance?

Q40)If a colour blind woman marries a normal visioned man, their sons will be:

Q41)A human male produces sperms with the geno-types AB, Ab, AB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

Q42)Inheritance of skin colour in humans is an - example of:

Q43)The two polynucleotide chains in DNA are:

Q44)In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

Q45)Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F2 segration will show:

Q46)A common test to find the genotype of a hybrid is by:

Q47)Which one of the following condition in humans is correctly matched with its chromosomal abnormality/linkage?

Q48)Point mutation involves:

Q49)Select he incorrect statement from the following

Q50) Sickle cell anemia is:

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