Question Detail

BIO 201 Genetics 1 Objective Question
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Question

In genetics, what is the precise definition of a 'testcross'?
Options
A A cross between two individuals of identical heterozygous genotypes
B A cross between an individual showing a dominant phenotype and an individual homozygous recessive for that trait
Correct Answer
C A cross swapping the phenotypic sexes of the parental lines
D Crossing an F1 progeny with the homozygous dominant parent
Correct Answer

Option B is the correct answer.

Detailed Explanation

A testcross involves crossing an organism showing a dominant phenotype (genotype unknown: AA or Aa) with a homozygous recessive individual (aa) to deduce its genotype.

Hint

No hint available

Question Info

Course: BIO 201
Topic: Genetics 1
Type: Objective
Difficulty: Not specified
Question 227 of 285
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