Sex-Linked Traits Boy or Girl? The Y Chromosome “Decides” Y chromosome

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Sex-Linked Traits Boy or Girl? The Y Chromosome “Decides” Y chromosome

What are Sex Linked Traits? In 1910, Thomas Morgan discovered traits linked to sex chromosomes in fruit flies. Some genes are attached to the X and Y chromosomes EXAMPLE: In humans, colorblindness and baldness are found on the X chromosomes

What are Sex Linked Traits? In Men, traits expressed anytime present In Women, must have two genes to show trait Children inherit baldness from their mothers

Punnett Square: What sex will the offspring be? 50% chance of a male or a female child.

Baldness is carried by the mother Phenotype: 25% bald males 25% bald carrier females 25% not bald males 25% non-carrier females

If Dad is bald, will you be bald? Phenotype: 0% bald males 100% bald carrier females

What if Mom is bald? Phenotype: 100% carrier females 100% bald males