Question Detail

BIO 101 Last Min Prep 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? A. 120 B. 40 C. 80 D. 60
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) gives F1 all Tt (tall). F2 from Tt x Tt gives genotypic ratio 1 TT : 2 Tt : 1 tt. So, out of 160 offspring, the number of heterozygotes (Tt) is (2/4) * 160 = 80. These are tall.

Hint

Heterozygotes are 2 out of every 4 offspring.

Question Info

Course: BIO 101
Topic: Last Min Prep
Type: Objective
Difficulty: Not specified
Question 2177 of 2556
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