Question

samples of sex cells from four couples were collected and screened for the presence of a specific gene mutation. the table shows the results of the procedure. based on the information provided, which couple would have the greatest chance of passing on the gene mutation to its offspring? couple 2 couple 4 couple 3 couple 1

Explanation:

Step1: Understand inheritance

Offspring get genetic material from both sperm and egg.

Step2: Analyze each couple

• Couple 1: Sperm (-), Egg (+). Only one cell has mutation.
• Couple 2: Sperm (+), Egg (-). Only one cell has mutation.
• Couple 3: Sperm (+), Egg (+). Both cells have mutation.
• Couple 4: Sperm (-), Egg (-). No mutation in either cell.

Since offspring inherit from both sperm and egg, Couple 3 has the highest chance as both their sex - cells (sperm and egg) carry the mutation.

Answer:

C. Couple 3