1. Hemophilic is a sex-linked trait and a recessive disorder. Suppose the dominant allele is h+, and the recessive allele is -h.
It is an X-linked trait, If the male is hemophilic then his genotype is X-hY, and the female is the carrier of this disease, then her genotype is X+hX-h.
Parents- (Male)X-hY * (female) X+hX-h
Gametes- X-h Y X +h X-h
F1 generation -
Gametes | X-h | Y |
X+h |
X-hX+h (carrier female) |
X+hY (normal male) |
X-h |
X-hX-h (hemophilic female) |
X-hY (hemophilic male) |
Total number of daughters- 2
Hemophilic female - 1
percentage of daughters that are hemophilic is :- (1/2)*100= 50%
2. Yellow body color in Drosophila is a recessive and sex-linked trait.
+b allele is dominant and gives wild type body color, and -b is recessive allele, which gives yellow color in homozygous condition.
a) yellow female X wild-type male
The genotype of yellow female - X-bX-b ; gametes- X-b and X-b
The genotype of wild-type male - X+bY; gametes - X+b and Y
F1 generation-
Gametes | X-b | X-b |
X+b |
X+bX-b (Wild type body color female) |
X+bX-b (wild type body color female) |
Y |
X-bY (yellow color boy) |
X-bY (yellow color boy) |
b) Wild-type (carrier) female x wild type male
The genotype of female - X+bX-b ; gametes - X-b and X+b
The genotype of male - X+bY ; gametes - X+b and Y
F1 generation-
Gametes | X+b | X-b |
X+b |
X+bX+b (wild type body color girl) |
X+bX-b (wild type carrier body color) |
Y | X+bY (wild type body color boy) |
X-bY (yellow body color boy) |
c) wild-type (carrier) female X yellow male
The genotype of female - X+bX-b ; gametes - X-b and X+b
The genotype of male - X-bY ; gametes - X-b and Y
F1 generation
Gametes | X-b | X+b |
X-b |
X-bX-b (Yellow body color girl) |
X-bX+b (wild type carrier girl) |
Y |
X-bY (yellow body color boy) |
X+bY (wild type body color male) |
Hemophilia is a sex-linked recessive trait. If a hemophiliac male marries a carrier female, what percent...
Hemophilia is a sex-linked X-linked recessive trait. A homozygous normal woman marries a normal man whose brother has hemophilia. What are the chances of them having a hemophiliac son; hemophiliac daughter?
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