Question

A student claims that dominant traits are always the most common traits. Is this true? Why or why not?(1 point)

No, dominant traits in general tend to be less common in the population and continue to persist only because they are dominant over more common recessive alleles.

Yes, dominant traits are called dominant because they are the most common.

No, dominant traits only show up if they are inherited; how common they are is not influenced by this.

Yes, dominant traits became more common over time as they are passed down from generation to generation; recessive alleles continue to become less common over time.
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Which statement below correctly describes a component of sexual reproduction?(1 point)

Only dominant alleles are passed to offspring.

Each parent has two alleles per trait and passes one allele to their offspring.

Each parent has two alleles and they pass both down to their offspring.

One parent passes down the majority of genes an offspring will receive.
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A chart shows allele combinations for brown/blonde hair: Father’s Mother, Bb; Mother’s Mother, BB; Mother, Bb; Child, bb. What allele combinations are missing?

Genetic Inheritance of Eye Color Through Generations
Father’s Father
(brown hair) Father’s Mother
(brown hair)
Bb Mother’s Father
(blond hair) Mother's Mother
(brown hair)
BB
Father
(brown hair) Mother
(brown hair)
Bb
Child
(blond hair)
bb
Match each person with the correct allele combination.

(1 point)
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Mother’s Father
Father
Father’s Father
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Answer 1

1) Correct answer: No — "No, dominant traits only show up if they are inherited; how common they are is not influenced by this."

Explanation: Dominance describes how an allele affects the phenotype when paired with another allele, not how frequent that allele is in a population. Allele frequency is shaped by mutation, selection, genetic drift, migration, etc.

2) Correct answer: "Each parent has two alleles per trait and passes one allele to their offspring."

Explanation: During sexual reproduction each parent contributes one of their two alleles for a trait (via gametes).

3) Matches:
- Mother’s Father: bb (blond)
- Father: Bb (brown, carrier of blond)
- Father’s Father: Bb (brown)

Reason: The child is bb, so each parent must provide a b allele. The mother is given as Bb, so the father must be Bb (brown but a carrier). Given the father’s mother is Bb, the father’s father is shown as Bb to account for the father’s genotype.