3.Among Urepian Rock-things, skin texture is determined by a single autosomal ge

Question

3.Among Urepian Rock-things, skin texture is determined by a single autosomal gene. The wild type allele of this gene (th+) codes for hard, scale-like skin, whereas a mutant allele (th) codes for soft, smooth skin. When a Rock-thing with hard skin is crossed with a Rock-thing whose phenotype is soft, smooth skin, only smooth, soft-skinned offspring are ever observed. One possible answer is that: (Hint: For each answer, see if the offspring phenotypes are consistent the parental matings).

A. the parental Rock-thing with the soft, smooth skin is homozygous at the gene and the th allele is dominant.

B. the parental Rock-thing with the hard skin is heterozygous for the gene and the th+ allele is dominant.

C. the parental Rock-thing with the hard skin is homozygous at the gene and the th+ allele is dominant.

D. the parental Rock-thing with the soft, smooth skin is heterozygous at the gene and the th+ allele is dominant.

E. neither allele is dominant

Explanation / Answer

C. the parental Rock-thing with the hard skin is homozygous at the gene and the th+ allele is dominant

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