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(1) When a single gene produces two, effects and one of it is lethal, then the ratio, Is..., , (al 2.1. (c) 1:2:1, , (b) 1:1 (d) 1:1:1:1, , (2) When two genes control a single, character and have cumulative effect, the, ratio is, , (a) 1:1:1:1 (ce) 1:2:1, , (b)1:4:6:4:1 (d) 1:6:15:20:15:6:1, , (3) Genes located on the same locus but, show more than two different phenotypes, are called ...., , (a)polygenes (b) multiple alleles, , (c) co-dominants (d) pleiotropic genes

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(4) Genotype refers to the genetic, composition of, , (a)an organism (b) an organ, (c)chromosomes (d) germ cells, (5) Individuals having identical alleles of a, gene are known as, , (a) homozygous (c) hybrids, , (b) heterozygous (d) dominants, , (6) If a heterozygous tall plant is crossed, with a homozygous dwarf plant. the, proportion of dwarf progeny will be, , (a) 100 per cent (b) 75 per cent, , (c) 50 percent (d) 25 per cent

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(7) The three principles of Mendelism are, (a) Dominance, segregition and independent, assortment, , (b) Linkage, segregation and independent, assortment, , (c) Linkage, dominance and segregation, (d) Linkage dominance and independent, assortment, , (8) Which one of the following is back, cross?, , (a) F1x F1 (b) F1xRecessive parent, , (c) F1x Dominant parent (d) F1x Any parent, (9) Which one of the following is a true, pleiotropic gene?, , (a) HbA (c) HbD, , (b) Hbs (d) HbP

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(15) If the genes are located ina, chromosome as p-q-rs-t, which of the, following gene pairs will have least, probability of being inherited together?, (a) pandq(b)rands, , (c)s andt(d) pands, , (16) Find the mismatched pair, , (a) Down's syndrome = 44 + XY, , (b) Turner's syndrome-44+X0, , (c) Klinefelter's syndrome - 44 + XXY, (d) Super female-44+XXX, , (17) A colour blind man marries a woman,, who is homozygous for normal colour, vision, the probability of their son being, colour blind is, , (a) 0% (b) 25% (e) 50% (d) 100%