Question

question #1
why is it difficult to predict most genetic traits in humans?
a most human traits are controlled by multiple genes and/or multiple alleles.
b most human traits are not inherited from one generation to the next.
c the dominant and recessive alleles for most human traits change with each generation.
d it is unknown how many alleles for most human traits children will inherit from each parent.
question #2

Explanation:

• Option A: Many human traits are polygenic (controlled by multiple genes) and/or involve multiple alleles. This complexity makes it hard to predict traits as it's not a simple Mendelian inheritance pattern (where one gene with two alleles determines a trait). For example, height is a polygenic trait.
• Option B: This is incorrect. Most human traits are inherited from one generation to the next. Inheritance is a fundamental principle in genetics.
• Option C: The dominant and recessive nature of alleles for a particular gene (assuming simple dominance - recessive relationships for a single - gene trait) is relatively stable. It's not that they change with each generation for most traits.
• Option D: While there is some randomness in allele inheritance (due to meiosis and fertilization), we know the basic rules of how alleles are passed (e.g., Mendel's laws). The main issue is the complexity of multiple genes and alleles, not just the unknown number of alleles inherited.

Answer:

A. Most human traits are controlled by multiple genes and/or multiple alleles.