Principle Of Inheritance And Variation Question 605
Question: In an organism, pink spot is a sex-linked recessive trait and black hair is dominant to white. If a pink spotted black heterozygous female is mated to a white male which is not spotted, the phenotypic ratio of the offspring would be [JIPMER 1994]
Options:
A) 1/4 spotted black; 1/4 pink spotted white; 1/4 unspotted black; 1/4 unspotted white
B) 1/2 pink spotted black; 1/2 pink spotted white
C) 3/4 pink spotted black; 1/4 pink spotted white
D) 3/4 unspotted black ; 1/4 pink spotted white
Show Answer
Answer:
Correct Answer: A
Solution:
$ \frac{1}{4} $ Black unspotted, $ \frac{1}{4} $ Black pink spotted $ \frac{1}{4} $ White unspotted, $ \frac{1}{4} $ White, pink spotted Here B is dominant over b and R is dominant over r.
BETA
