Question Detail

BIO 101 BIO 101 Past Questions Objective Question
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Question

How many of 160 F2 offspring from a monohybrid cross of a true breeding tall and short Pisum sativum will be heterozygote tall?
Options
A 120
B 40
C 80
Correct Answer
D 60
Correct Answer

Option C is the correct answer.

Detailed Explanation

A monohybrid cross (TT x tt) yields an F1 generation of all Tt (heterozygous tall). When these are self-crossed (Tt x Tt), the F2 genotypic ratio is 1 TT : 2 Tt : 1 tt. The heterozygous tall (Tt) represent 2 out of every 4 offspring, or 1/2. Half of 160 is 80.

Hint

What is the expected genotypic ratio from a cross of two heterozygotes?

Question Info

Course: BIO 101
Topic: BIO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1113 of 2556
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