Use your knowledge of genetics and pedigrees to complete this worksheet.
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Sex-linked traits are those whose genes on the sex chromosomes and are found only on the X
chromosome, not on the Y chromosome.
Males: XY - have only 1 copy of the gene
Females: XX - have 2 copies of the gene.
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Females can be normal, show the trait, or be carriers. Males can either be normal or show the trait, but
cannot be carriers.
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Genetics
1. In squids, eye color is a sex linked trait. Red is dominant to black. XR represents
red eyes and X represents black eyes.
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A. What the sexes and phenotypes of squids with the following genotypes:
Microsoft
XRX
XRY
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English (US
XRXR
XY
B. What are the genotypes of these squids:
Red eyed, male
Red eyed female
Black eyed female
Black eyed male:
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