A particular person is said to be a carrier of a genetic...

Name: Problem 2, Chapter 8: Biology Now
Uploaded: 2021-09-10T08:29:18-08:00
Duration: 1 min 5 s
Channel: Joanna Quigley
Description: A particular person is said to be a carrier of a genetic trait. What does this tell you about their phenotype? (a) They physically show the trait. (b) They physically show the trait more than a noncarrier would show the trait. (c) They are almost normal but show an intermediate phenotype for the trait. (d) They are completely normal and do not physically show the trait.

A particular person is said to be a carrier of a genetic trait. What does this tell you about their phenotype? (a) They physically show the trait. (b) They physically show the trait more than a noncarrier would show the trait. (c) They are almost normal but show an intermediate phenotype for the trait. (d) They are completely normal and do not physically show the trait.

A particular person is said to be a carrier of a genetic trait. What does this tell you about their phenotype?
(a) They physically show the trait.
(b) They physically show the trait more than a noncarrier would show the trait.
(c) They are almost normal but show an intermediate phenotype for the trait.
(d) They are completely normal and do not physically show the trait.

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Key Concepts

Phenotype

Phenotype refers to the observable physical, biochemical, and physiological characteristics of an organism, which result from the interaction between its genetic makeup and its environment. In the context of carriers, the phenotype appears normal because the trait associated with the recessive allele is not expressed, even though the gene is present.

Dominance and Recessiveness

The concept of dominance and recessiveness in genetics explains how different versions of a gene (alleles) interact to produce the organism's phenotype. In many cases, if an individual carries one dominant allele and one recessive allele, the dominant allele will determine the phenotype, meaning that carriers of a recessive trait do not show the associated characteristics because the dominant allele masks the expression of the recessive one.

Genetic Carrier

A genetic carrier is an individual who possesses one copy of a recessive allele for a particular trait or disorder but does not exhibit the physical symptoms associated with that trait. This is typically because the presence of a dominant allele masks the effect of the recessive allele, resulting in a normal phenotype despite the latent genetic risk.

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