a certain human disorder causes gradual deterioration of the muscles. only boys are affected, and they are always born to phenotypically normal parents. due to the severity of the disease, the boys die in their teens. is this disorder likely to be caused by a dominant or recessive allele? is its inheritance sex-linked or autosomal?

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21-11-2022
Biology

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a certain human disorder causes gradual deterioration of the muscles. only boys are affected, and they are always born to phenotypically normal parents. due to the severity of the disease, the boys die in their teens. is this disorder likely to be caused by a dominant or recessive allele? is its inheritance sex-linked or autosomal?

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arenasaleem890 arenasaleem890 · Answer 1 · 2022-11-26T13:23:03+01:00

Since the parents have a normal phenotype, this disorder must be caused by a recessive allele.

The phenotype, in genetics, is a group of an organism's qualities or observable features. The phrase includes an organism's morphology, or physical shape and structure, as well as its physiological and biochemical characteristics, behaviour, and the outcomes of behaviour. An individual's observable traits that are the outcome of gene expression; the way a person with a certain genotype presents themselves clinically.

Each gene has two recessive alleles, which come from each parent, which are inherited by each person. For a recessive trait, the two recessive alleles of the gene that causes the characteristic must both be present for the trait to manifest. When only one copy of an allele is present, it does not result in any phenotype at all.

learn more about recessive alleles here

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