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These traits are often passed from a carrier mother to an affected son.

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It is found on the X chromosome, not the Y. But in females, where the Z chromosome does not recombine, the two alleles always pass to offspring together.

The result is that females will have two copies of the sex-linked gene while males will only have one copy of this gene. Egg and sperm join to make a zygote, which develops into a new offspring. In pigeons, the color and dilute genes are not only sex-linked, they are also genetically linked.

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Females will have two X-linked alleles because females are XX , whereas males will only have one X-linked allele because males are XY. Because, males only have one X chromosome, they have a much greater chance of having red-green colorblindness. Homologous chromosomes have the same genes arranged in the same order. For genes on autosomes, we all have two copies—one from each parent. Males are more likely to be affected than females.
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  1. In this pedigree, the carrier heterozygous females are indicated; however, they do not express the trait being tracked in this pedigree.