Three-Factor Testcrosses Are Only Informative in Gene Mapping When Which

question 26

Multiple Choice

Three-factor testcrosses are only informative in gene mapping when which of the following occurs?

• A) One parent is homozygous recessive for the three genes, and the other parent is homozygous dominant.
• B) All three genes are located on separate chromosomes, and one parent is homozygous dominant for at least two of these genes.
• C) Both parents are homozygous for the three genes.
• D) One parent is heterozygous for the three genes, and the other parent is homozygous recessive.
• E) One of the genes must be located on a sex chromosome and be heterozygous, and the other two genes must be located on an autosome and be homozygous.

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Definitions:

Recall

The act of retrieving information or memories from the past, often without the stimulus that initially encoded the memory.

Confusion

A state of bewilderment or uncertainty where a person has difficulty in understanding situations or making decisions.

Decay

The process of gradual deterioration or the breakdown of organic matter by the action of bacteria and enzymes, or, in terms of memory, the fading of information over time.

Stored Information

Stored information refers to data or knowledge that has been saved and can be retrieved from an individual's memory or a storage device.