Two Genes with Two Alleles Each Are 30 CentiMorgans (Map

question 44

Multiple Choice

Two genes with two alleles each are 30 centiMorgans (map units) apart.A double heterozygote whose parents were homozygous dominant and homozygous recessive is crossed to a double homozygous recessive.What frequency in the progeny will be double homozygotes?

• A) 0 percent
• B) 15 percent
• C) 30 percent
• D) 35 percent
• E) 70 percent

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Definitions:

Germinal Period

The first two weeks of prenatal development after conception, characterized by rapid cell division and the beginning of cell differentiation.

After Conception

The period of time following the moment of conception, referring to the development of the embryo and fetus during pregnancy.

False Positive

The result of a laboratory test that reports something as true when in fact it is not true. This can occur for pregnancy tests, when a woman might not be pregnant even though the test says she is, or during pregnancy, when a problem is reported that actually does not exist.

Laboratory Test

An examination of materials, organisms, or physical reactions conducted under controlled conditions to gather data or insights.