NEET MODEL BIOLOGY 2

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

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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?

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

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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:

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Q5)A gene is said to be dominant if:

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

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

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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?

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

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Q10)Christmas disease is another name for:

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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:

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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:

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

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

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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:

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

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

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Q18)A self-fertilizing trihybrid plant forms:

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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:

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

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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?

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

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

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

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

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

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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:

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

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

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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?

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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:

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

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Q33)Phenotype of an organism is the result of

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Q34)Test cross involves:

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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?

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

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

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

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

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

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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?

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

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Q43)The two polynucleotide chains in DNA are:

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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?

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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:

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

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

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Q48)Point mutation involves:

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Q49)Select he incorrect statement from the following

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Q50) Sickle cell anemia is:

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NEET MODEL BIOLOGY 2
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