Red-green colorblindness is an X-linked recessive disorder...

Red-green colorblindness is an X-linked recessive disorder in humans. Your friend is the daughter of a colorblind father. Her mother had normal color vision, but her maternal grandfather was colorblind. What is the probability your friend is colorblind? (a) 1 (b) $1 / 2$ (c) $1 / 4$ (d) $3 / 4$ (e) zero

Red-green colorblindness is an X-linked recessive disorder in humans. Your friend is the daughter of a colorblind father. Her mother had normal color vision, but her maternal grandfather was colorblind. What is the probability your friend is colorblind?
(a) 1 (b) $1 / 2$ (c) $1 / 4$ (d) $3 / 4$ (e) zero

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Key Concepts

Pedigree Analysis

This involves studying the family tree and inheritance patterns to deduce the genotypes of individuals. By analyzing the family members' traits across generations, it is possible to identify carriers and predict the distribution of the disorder in future generations.

Genetic Probability Calculation

This concept uses principles of Mendelian genetics to calculate the likelihood of inheriting specific alleles from the parents. It involves assessing the genetic contributions from each parent based on carrier status and the mode of inheritance to determine the probability of an offspring being affected or a carrier.

Carrier Status

Carriers are individuals who possess one copy of a recessive mutant allele but do not show the phenotype of the disorder. In X-linked disorders, females can be carriers if one of their X chromosomes carries the mutation, which is crucial for assessing the risk of passing the condition to offspring.

X-linked Recessive Inheritance

This is a pattern of inheritance where the mutated gene causing the trait or disorder is found on the X chromosome. Because males have one X chromosome, they express the trait if they inherit a single mutated allele, whereas females with two X chromosomes usually need two copies of the mutation to be affected, often making them carriers without symptoms.

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