Free ears in dogs are controlled by the dominant allele (F), and attached ears are controlled by the recessive allele (f). In addition, short hair in dogs is due to a dominant allele (S), and long hair is due to a recessive allele (s). Which of the following is the genotype of a dog with attached ears and short hair?
ffSs is the genotype of a dog with attached ears and short hair.
The recessive trait for attached ears (ff) indicates that the dog must have two recessive alleles. The dominant trait for short hair (S) can be present as either homozygous dominant (SS) or heterozygous (Ss), and since the dog has short hair, it can be represented as Ss.
This genotype indicates a dog with free ears (due to the homozygous dominant FF) and short hair (due to the homozygous dominant SS). Since this dog cannot have attached ears, this option is incorrect.
This genotype represents a dog with attached ears (ff) and long hair (ss). Since the question specifies that the dog has short hair, this option is also incorrect.
In this case, the dog would have free ears (Ff) and short hair (Ss). However, the presence of at least one dominant allele (F) means this dog cannot have attached ears, making this option incorrect as well.
This genotype correctly shows a dog with attached ears (ff) and short hair (Ss). The presence of the recessive alleles for ears ensures the attached ear trait, while the presence of one dominant allele for hair (S) allows for short hair. This combination accurately describes a dog with the specified traits.
The genotype of a dog with attached ears and short hair must consist of two recessive alleles for ears (ff) and at least one dominant allele for short hair (S). The only option that meets these criteria is ffSs, which ensures the correct expression of both traits. Thus, understanding dominant and recessive alleles is crucial for determining the phenotypic characteristics of an organism.
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