X and Y chromosomes follow the principle of segregation. What does this mean? In

Question

X and Y chromosomes follow the principle of segregation. What does this mean? In mammals, females are XX and males are XY. If an individual is XY, then each gamete gets one X or one Y. At prophase of meiosis I, X and Y synapse and crossing over occurs. They are physically separated (segregated). In this class and other classes at the U, you'll write X-linked alleles as X^R and X^r. If you're keeping track of more than one X-linked allele at a time, you'd write the chromosomes as X^RB and X^rb (or whatever the genotype actually is for the Rand B genes). Suppose a male carries an X chromosome with the R allele and the b allele. How would you write his genotype?

Explanation / Answer

If an individual is XY, then each gamete gets one X or one Y.

The genotype might be written as XRbY

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