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BIO 101 BIO 101 Past Questions Objective Question
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Question

In a dihybrid cross between two heterozygotes (AaBb x AaBb), what is the expected phenotypic ratio?
Options
A 9:3:3:1
Correct Answer
B 1:2:1
C 3:1
D 1:1:1:1
Correct Answer

Option A is the correct answer.

Detailed Explanation

For two genes that assort independently, a cross between two dihybrid heterozygotes (AaBb) yields a classic 9:3:3:1 phenotypic ratio in the offspring: 9 with both dominant traits, 3 with one dominant/one recessive, 3 with the other dominant/other recessive, and 1 with both recessive traits.

Hint

This is Mendel's classic dihybrid ratio.

Question Info

Course: BIO 101
Topic: BIO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 892 of 2556
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