Question

characters in humans such as a persons red and white blood cell counts vary quite a bit depending on such factors as altitude and physical activity. traits like this are referred to as...

○ completely dominant.
○ recessive.
○ polygenic.
○ multifactorial.

Explanation:

Multifactorial traits are influenced by multiple genetic and environmental factors. In this case, red and white blood cell counts are affected by factors like altitude (environmental) and physical activity (behavioral/environmental), which aligns with the concept of multifactorial inheritance.

• Completely dominant refers to a single - gene inheritance pattern where one allele masks the other, which is not the case here as multiple factors are at play.
• Recessive also pertains to single - gene inheritance (where the trait is only expressed when two recessive alleles are present), not relevant for the described trait.
• Polygenic means controlled by multiple genes, but it does not account for the environmental factors (like altitude and physical activity) that influence the trait in question.

Answer:

multifactorial.