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Pedigrees help geneticists understand how traits are inherited between generations. Red-green color blindness is a sex-linked disorder that is determined by a recessive allele on the X chromosome.

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If Brian has a son who is color-blind, what is known about the genotype of the son's mother?
She must have at least one allele for color blindness.
She must have two alleles for color blindness.
She cannot be homozygous recessive for the gene for color blindness.
She cannot be a heterozygous carrier of the gene for color blindness.

Respuesta :

nadelynp
Red/green color blindness is passed down from mother to son and so we can conclude that the last two statements are wrong. Which are that "She cannot be homozygous recessive for the gene for color blindness" and "she cannot be a heterozygous carrier of the gene for color blindness "From the information proved we know that the mother must have at least one allele for color blindness.

As per the given scenario, the mother must have one allele for color blindness, i.e., option B is correct.

What is an allele?

At a given genomic location, an allele is one of two or more versions of a DNA sequence.

For any given genomic location where such variation exists, an individual inherits two alleles, one from each parent.

In the given scenario, son of Brian is color blind so, the genotype of son's mother seems to have one allele of color blindness.

Thus, the correct option is B.

For more details regarding allele, visit:

https://brainly.com/question/7602134

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