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Two rough-coated (curly hair) guinea pigs produce an offspring with a smooth coat.
Select the statement(s) that accurately predict the outcome for the cross between these two parents.
A genetic mutation caused the offspring to have a smooth coat.
Both parents carry the smooth coat trait in their genes.
Rough coat is dominant to smooth coat.
Smooth coat is dominant to rough coat.
The smooth coat offspring inherit the gene from both parents.
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GPT-5 mini
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Accurate statements:
- Both parents carry the smooth coat trait in their genes.
- Rough coat is dominant to smooth coat.
- The smooth coat offspring inherit the gene from both parents.
Explanation: If rough (R) is dominant and smooth (r) is recessive, two phenotypically rough parents can be heterozygous (Rr). An Rr × Rr cross gives genotypes RR:Rr:rr (1:2:1), so rr (smooth) appears in 25% of offspring — the smooth pup got an r allele from each parent. A new mutation is not required, and "smooth coat is dominant" is inconsistent with the observed outcome.
- Both parents carry the smooth coat trait in their genes.
- Rough coat is dominant to smooth coat.
- The smooth coat offspring inherit the gene from both parents.
Explanation: If rough (R) is dominant and smooth (r) is recessive, two phenotypically rough parents can be heterozygous (Rr). An Rr × Rr cross gives genotypes RR:Rr:rr (1:2:1), so rr (smooth) appears in 25% of offspring — the smooth pup got an r allele from each parent. A new mutation is not required, and "smooth coat is dominant" is inconsistent with the observed outcome.
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