Studies Comparing the Similarity of Identical and Fraternal Twins Who

question 46

Multiple Choice

Studies comparing the similarity of identical and fraternal twins who are raised together and apart are especially informative because:

• A)they tell us about the relative importance of the environment and genetic factors.
• B)they only tell us about the importance of the environment.
• C)they only tell us about the importance of genetic factors.
• D)they tell us what genes may be responsible for the occurrence of twins.

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Definitions:

Alleles

Different forms of a gene that arise by mutation and are found at the same place on a chromosome.

Gene Interaction

The ways in which different genes influence each other's expression, often leading to complex traits or outcomes in an organism.

Calico Cats

Cats characterized by a tri-color fur pattern, typically involving patches of orange, black, and white, this pattern is most commonly found in female cats due to genetic linkage to the X chromosome.

X Chromosome Inactivation

A process in female mammals where one of the two X chromosomes is inactivated to ensure dosage compensation for gender-based genetic differences.