Suppose a gene has seven alleles. What would be the number of alleles in an individual at any instant?

(1) 1

(2) 7

(3) 2
(4) 3

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In case of starch synthesis in pea seeds [controlled by B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and Heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?

(1) The gene B mutates at a faster rate.

(2) The gene B is easily influenced by the environment

(3) Dominance is not an autonomous feature of a gene or the product that it has information for

(4) Some genes do not follow the law of segregation.

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"When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters". This is the statement of:

(1) Law of Dominance

(2) law of segregation

(3) Law of Independent Assortment

(4) Law of Linkage

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When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. this can be attributed to the fact that:

(1) The genes are located on X and Y chromosomes

(2) Fruit fly has abnormal chromosomes

(3) The genes are located on the X chromosome

(4) the genes exhibit incomplete dominance

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When the two genes in a dihybrid cross are situated on the same chromosome:

(1) The proportion of parental gene combinations was much higher than the non-parental type

(2) The proportion of parental gene combinations was much lesser than the non-parental type.

(3) The propagation of parental gene combinations was equal to the non-parental type

(4) Only recombinants are formed

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A couple has a daughter. What is the probaility that their next child will be a daughter?

(1) 0 %

(2) 25 %

(3) 50 %

(4) 100 %

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It is unfortunate that in our society women are blamed for producing female children and have been obstracised and ill-trated because:

(1) The sex is determined by the type of sperm fertilizing the egg.

(2) The sex is determined by the type of egg fertilizing the sperm.

(3) the sex is determined by the hormones produced by the fetus

(4) the sex is determined by the God's Will

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A test cross is done to find out

(1) Fitness of an organism

(2) Genotype of a plant expressing dominant phenotype

(3) The suitable parents for a Mendelian Cross

(4) The hidden genotypic ratio of F2 phenotypes

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Identify the incorrect statement:

(1) In addition to recombination, mutation is another phenomeonon that leads to variation in DNA.

(2) Chromosomal aberrations are commonly observed in cancer cells.

(3) A classical example of a point mutation is sickle cell anaemia.

(4) Non ionising radiations cannot be mutations. 

 

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Pedigree analysis is resorted to for genetic analysis in humans rather than conventional genetic methods because:

I. Choice matings are not possible

II. Number of progeny is limited

Of the two statements:

(1) Only I is correct

(2) Only II is correct

(3) Both I and II are correct

(4) Both I and II are incorrect

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