Question

A cross between AaBB X aa BB yields a genotypic ratio of

• A. 1 AaBB : 1 aaBB
• B. 1 AaBB : 3 aaBB
• C. 3AaBB : 1 aa BB
• D. All AaBb

Answer 1

The correct option is A 1 AaBB : 1 aaBB

A parent with genotype AaBB will produce two types of gametes, namely AB and aB. A parent with genotype aaBB will produce only one type of gamete, that is aB. When a cross is made between these parents, the genotype of offsprings will be AaBB and aaBB in the ratio of 1:1.

Thus, the correct answer is '1 AaBB : 1 aaBB.'