Question

this passage describes the huntingtons disease trait in humans:
huntingtons disease is a condition that causes the death of brain cells over time. this loss of cells interferes with brain function and may lead to uncontrolled movements, difficulty thinking, and changes in behavior.
in a group of humans, some individuals have huntingtons disease and others do not. in this group, the gene for the huntingtons disease trait has two alleles. the allele for having huntingtons disease (h) is dominant over the allele for not having huntingtons disease (h).
the punnett square below shows a cross between two humans. consider the phenotypes of the offspring shown. select one box that represents offspring that have huntingtons disease.
h h
h hh hh
h hh hh

Explanation:

Step1: Recall Dominant Allele Rule

A dominant allele (H) shows its trait even with one copy. So genotypes with H (Hh) have the disease, hh do not.

Step2: Analyze Punnett Square Boxes

• Top - left: Hh (has H, so disease).
• Top - right: Hh (has H, so disease).
• Bottom - left: hh (no H, no disease).
• Bottom - right: hh (no H, no disease).

Answer:

Either the top - left (Hh) or top - right (Hh) box (e.g., the box with "Hh" in the top - left or top - right of the Punnett square).