A parent organism of unknown genotype is mated in a test cross. Half of the offspring have the same phenotype as the parent. What can be concluded from this result?

AThe parent is homozygous dominant for the trait.
BThe trait being inherited is polygenic.
CThe parent is heterozygous for the trait.
DThe parent is homozygous recessive for the trait.

Question

04-05-2015
Biology

Answered

A parent organism of unknown genotype is mated in a test cross. Half of the offspring have the same phenotype as the parent. What can be concluded from this result?

AThe parent is homozygous dominant for the trait.
BThe trait being inherited is polygenic.
CThe parent is heterozygous for the trait.
DThe parent is homozygous recessive for the trait.

Verified Answer :

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lulu1991 lulu1991 · Answer 1 · 2015-05-04T23:02:09-04:00

The answer is C. The test cross means that the unknown genotype organism is mated with a homozygous recessive organism("aa"). If the parent organism is homozygous("AA" or "aa"), the offspring will all be the same with the parent(Aa when the parent is "AA". "aa" when the parent is "aa"). So the half of the offspring have the same phenotype means the parent organism is heterozygous. We cannot confirm whether this is polygenic or not by test cross.