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miskamm [114]
3 years ago
13

The presence of a beard on some goats is determined by an autosomal gene that is dominant in males and recessive in females. Het

erozygous males are bearded, while heterozygous females are beardless. What type of inheritance is exhibited by this trait?
Biology
1 answer:
Anvisha [2.4K]3 years ago
5 0

Answer:

Explanation:

Some autosomal genes may affect the phenotypes of individuals of one sex more than individuals of the other but they play no part in the development of being a male or being a female. this type of gene is thus a sex influenced autosomal gene. The type of inheritance exhibited by this trait in the male goat follows the autosomal dominant pattern of inheritance meaning the for the trait to be expressed, it has to be the dominant allele form on the X chromosome. In the females, this trait follows the autosomal recessive pattern of inheritance such that for a female goat to be bearded, the trait must be inherited as a homozygous recessive trait, while an heterozygous or a homozygous dominant female will be beardless.

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Answer:

The genotype for each of the parents must be

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Please note that a dominant trait is a trait that is expressed phenotypically in a heterozygous state, while a recessive trait is a trait that can only be expressed in a homozygous state.

Now, since gray face (G) for Oompa Loompas is dominant, and orange face (g) is recessive, for an offspring to be orange faced, it means that the genotype of the offspring must be 'gg'. Also, since both parent contribute an allele in the pair of alleles in the offspring, both parents must have the recessive (g) in their genotype. Moreover, we are told that both parents are gray-faced, meaning that their genotypes were 'Gg' and 'Gg'. To confirm, let me do the cross

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G                                GG       Gg

g                                 Gg        gg

from the cross above, we find out that out of 4 offspring, 3 were gray face (GG, Gg ) while one was orange face (gg).

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