Question

please answer question 1-4 with a breif explanation

thankyou

1. In humans, red-green color-blindness is a sex-linked (carried on the X chromosome) recessive trait. If a woman who is not color blind but whose father was color-blind marries a man who is not color-blind, what is the probability that their first child will be a daughter who is color- blind? a) 0 b) 25% c) 50%- d) 100%- e) cannot tell from the information given 2. In a certain species of plants, seed size is controlled by two genes (A and B), each with two alleles that show incomplete dominance and each of which contributes equally to the phenotype. Plants with the largest seeds have the genotype AA BB, while those with the smallest seeds have the genotype aa bb. If two plants heterozygous for both genes are crossed, among the offspring there will be possible genotypes and_ possible phenotypes. a) 33 b) 6; 5 c) 6; 6 d) 9; 5 e) 9; 9 3. In another plant species, the presence and type of hairs on the plant are controlled by epistatic interaction between two independently assorting genes. Gene C determines whether the plant has hairs (dominant) or not (recessive); gene D determines whether the hairs are straight (dominant) or curly (recessive). In a cross between a straight-haired plant and a curly. haired plant, 1/4 of the offspring have no hairs, 3/8 have straight hairs, and 3/8 have curly hairs. Using capital letters to designate the dominant alleles and small letters to designate the recessive alleles, the genotypes of the two parent plants must have been a) CC DD; cc dd b) Cc Dd; Cc Dd c) Cc Dd; Cc dd d) cc Dd; Cc dd e) cannot tell from the information given 4. In a different plant species, flower color and fruit color are controlled by two independently assorting genes, both of which have two alleles that exhibit incomplete dominance. In both cases, the homozygous phenotypes are red and yellow and the heterozygous phenotype is orange. If two plants with orange flowers and orange fruits are crossed with one another, what proportion of the offspring will have orange flowers and orange fruits? a) 1/16 b) 1/8 c) 1/4 d) 3/4 e) All

Answer 1

1. Ans. (a) 0% probability that first child Will be a daughter who is color blind.

1. Women's Father a XT (color blind) Women yetue yety Mon - (Normal) X Mano & Women yet the Normal - Normal Son Color blind Cartier aughter Ans.(a ) 0% probability that first child will be a dughter who is color blind. N.B. There is 50% of a girl child will be a carrier of color blind