Consider a Trait Determined Entirely by Three Independently Assorting Genes

question 5

Multiple Choice

Consider a trait determined entirely by three independently assorting genes with two alleles in which one allele is dominant over the other. As in the wheat seed color example illustrated in Figure 18.4, imagine that each dominant allele contributes one unit to the phenotype of the trait. Individuals with a phenotype of  4 are affected and all other phenotypes are not affected. What is the concordance between same-sex fraternal twins?

• A)11%
• B)21%
• C)34%
• D)45%
• E)57%

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Definitions:

Skeletal Muscles

These are muscles attached to bones that are responsible for voluntary movements and are characterized by a striated appearance.

Latch State

A phase in muscle contraction where the muscle remains tense without much energy consumption, commonly found in smooth muscle.

Smooth Muscle Contraction

The involuntary process by which smooth muscles found in the walls of internal organs contract and relax, controlled by the autonomic nervous system.

Myosin Phosphatase

An enzyme that plays a critical role in muscle relaxation by dephosphorylating myosin light chains.