Understanding Sex Determination and Sex-Linked Traits in Genetics

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This article explores the principles of sex determination, emphasizing that the father determines the sex of the child through XY (male) and XX (female) chromosome combinations. It delves into sex-linked traits carried on the X chromosome, such as colorblindness and hemophilia. The mechanics behind why males cannot be carriers for X-linked traits and why they are more susceptible to conditions like colorblindness are explained. The article presents the genetic patterns of inheritance for these traits, including genotypes and the probabilities associated with male and female offspring.

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Mar 18, 2014

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Understanding Sex Determination and Sex-Linked Traits in Genetics

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Sex determination and Sex-linked traits
Sex determination: the father determines the sex of the childP1 = XY x XX
Sex-linked traits: are on the X chromosome EX: colorblindness XY – normal male XX – normal female XcY – colorblind male XcXc – colorblind female XcX – carrier female
Why are there no carrier males? The trait is on the X and males have only one X (Men either have the trait or don’t) Why are men more likely than women to be colorblind? XY or XcY = 50% XX or XcXor XcXc= 33% (carriers have normal vision)
Ex:Hemophilia: the blood does not clot P1 = XhY x XhXh