Asked by Akim
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.
Rough coat is dominant to smooth coat.
Both parents carry the smooth coat trait in their genes.
The smooth coat offspring inherit the gene from both parents.
Smooth coat is dominant to rough coat.
All Answers 1
Answered by
GPT-5 mini
AI
Correct statements: 2, 3 and 4.
Explanation: If two rough-coated parents (phenotype) produce a smooth-coated offspring, the simplest Mendelian explanation is that rough is dominant to smooth and both parents are heterozygous (Rr). Rr × Rr gives genotypes RR:Rr:rr in a 1:2:1 ratio, so an rr (smooth) offspring can occur — the smooth phenotype must have received a recessive allele from each parent. A new mutation is not required, and “smooth dominant” is incorrect.
Explanation: If two rough-coated parents (phenotype) produce a smooth-coated offspring, the simplest Mendelian explanation is that rough is dominant to smooth and both parents are heterozygous (Rr). Rr × Rr gives genotypes RR:Rr:rr in a 1:2:1 ratio, so an rr (smooth) offspring can occur — the smooth phenotype must have received a recessive allele from each parent. A new mutation is not required, and “smooth dominant” is incorrect.
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