Amy Doesn't Know It Yet, but She Is Pregnant

question 82

Multiple Choice

Amy doesn't know it yet, but she is pregnant. She conceived one week ago and has not yet missed a menstrual period. Amy's developing child is in the period of the

• A) fetus.
• B) zygote.
• C) embryo.
• D) endoderm.

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Definitions:

Double-ovulate

The occurrence of releasing two eggs during a single menstrual cycle, which can lead to fraternal twins if both eggs are fertilized.

X-linked

A term referring to genes or genetic conditions that are associated with the X chromosome, often affecting males more frequently or severely because they have only one X chromosome.

Dominant-recessive

describes a genetic pattern in which one allele overshadows the effects of another, recessive allele in determining a trait's appearance.

Additive Genes

Genes that each contribute to the characteristic—they “add up” rather than one being hidden (recessive). For example, skin color is additive: It shows the combined genes of both parents, rather than taking after one or the other.