Question

An organism has two different possible traits, A and B. A graph of the population is shown right. Which of the following statements is true about Trait B? Check all that apply.

It decreased in frequency over time.

It became extinct.

It is carried on a recessive allele.

Answer 1

I can’t see the graph you mention. Can you upload it or describe how Trait B’s frequency changes over time (starting value, ending value, whether it ever reaches zero)?

Meanwhile, here’s how to judge each statement from the graph:

- "It decreased in frequency over time."
True if the plotted frequency/percent of trait B is lower at the end than at the start (or shows a clear downward trend). False otherwise.

- "It became extinct."
True only if the frequency of trait B reaches zero (and stays at zero). If it falls but never reaches zero, it did not become extinct.

- "It is carried on a recessive allele."
You cannot determine this from a simple frequency vs. time graph. Whether a trait is recessive requires genetic or breeding data (e.g., phenotype of offspring from known crosses) or genotype frequency information; phenotype frequency alone is insufficient because recessive alleles can be hidden in heterozygotes.

Send the graph or the numerical/visual description and I’ll mark which statements are correct.