Final answer:
The man's genotype is Bb and his phenotype is big ears, indicating he is heterozygous for big ears, which is the dominant trait. Thus, the correct answer is A) Genotype: Bb, Phenotype: Big ears.
Step-by-step explanation:
The genotype and phenotype of a man who is heterozygous for big ears and reproduces with a woman who is homozygous recessive for small ears are as follows:
- Genotype: Bb
- Phenotype: Big ears
This means the correct answer is A) Genotype: Bb, Phenotype: Big ears. A heterozygous individual like this man has one dominant allele (B) and one recessive allele (b), which results in the expression of the dominant trait, big ears. Had he been homozygous recessive (bb), his phenotype would have been small ears because the recessive allele would be expressed in the absence of a dominant allele.