Question

In a particular species of mammal, black hair (B) is dominant to green hair (b), and red eyes (R) are dominant to white eyes (r). When a BbRr individual is mated with a bbrr individual, offspring are produced in a ratio of 5 black hair and red eyes:5 green hair and white eyes:1 black hair and white eyes:1 green hair and red eyes. Which of these explanations accounts for this ratio? 1. Green-haired individuals have a higher prenatal mortality than black-haired individuals.
2. The genes for hair color and the genes for eye color are carried on different chromosomes.
3. The expected results did not take genetic recombination into account.
4. The genes for both of these traits are carried on the autosomes.
5. The genes for hair color and eye color are linked.

Answer 1

The correct option is (5)

Explanation:

• The genes for hair color and eye color are linked.
• The linked genes are physically close to one another on the same chromosomes so they are most likely to be inherited together.
• Linked genes cannot be found on a different chromosomes.
• If genes are located closely,then their chances of recombination is more in comaprison to the genes which are located far on the same chromosomes.