Emma and Anna Are Identical Twins Who Were Adopted by Different

question 112

Multiple Choice

Emma and Anna are identical twins who were adopted by different families a few weeks after their birth. Although genetically identical, they grew up with different physical and psychological characteristics. For example, though both inherited a tendency to grow large, Anna was slim and athletic because of the active lifestyle practiced in her adoptive family. This variability can be explained by how

• A) each zygote is unique.
• B) longevity genes can make an individual less vulnerable to certain diseases.
• C) for each genotype, a range of phenotypes can be expressed.
• D) mutated genes can be a source of genetic variability.

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Definitions:

Trend

A general direction in which something is developing or changing over time.

Percentage Terms

Percentage terms refer to expressions or calculations presented as a fraction of 100, indicating a portion or ratio in relation to a whole.

Bottom 40%

Refers to the lower 40 percent of the income distribution, often used in discussions of income inequality.

Families

Social units consisting of groups of individuals related by blood, marriage, or adoption, forming a primary societal group for nurturing and socializing members.