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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