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CLEP Biology Sample Test

1 of 5

The allele for one form of color blindness is sex-linked recessive. A colorblind man marries a woman whose father had the same kind of colorblindness. What is the probability that the married couple’s daughter will be color blind if she is XO?

Correct Answer:

50%.

to answer the question about the probability of the couple's daughter being colorblind if she has turner syndrome (xo), we must consider the genetics of color blindness and the chromosomal situation described. color blindness is typically a sex-linked recessive disorder located on the x chromosome. this means that a male (xy) with one affected x chromosome will display color blindness because they do not have a second x chromosome to potentially carry a normal copy of the gene.

in this scenario, the father is colorblind, indicating he has the x chromosome with the colorblind allele (x^c). the mother’s father was also colorblind, meaning the mother must carry at least one x chromosome with the colorblind allele (x^c), as she would have inherited it from her father. since her mother (the grandmother of the potential child) is not mentioned as being colorblind, we can infer she likely has two normal x chromosomes (xx), one of which she passed to her daughter. therefore, the mother is a carrier with genotype x^cx.

turner syndrome (xo) occurs when a female inherits only one x chromosome. in the context of this question, the potential daughter could inherit either the x^c or the normal x from her mother. since the father can only pass on a y chromosome or nothing in the case of turner syndrome, the daughter's chromosomal makeup would be xo, where the x chromosome could be either normal or with the colorblind allele.

given that the mother has one normal x chromosome and one with the colorblind allele, there is a 50% chance that she will pass on the x chromosome with the colorblind allele to her daughter. if the daughter inherits this x chromosome and, due to turner syndrome, does not have a second x chromosome to counter the recessive trait, she will manifest color blindness. therefore, the probability that the daughter will be colorblind is 50%.

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CLEP Biology Aliases Test Name

Here is a list of alternative names used for this exam.

CLEP Biology
CLEP Biology test
CLEP Biology Certification Test
CLEP
CLEP
test
CLEP Biology ()
Biology certification