What do you notices about the x-link recessive mode of inheritance? Write the notes below in your notebook – shorten and paraphrase The trait is more common in males than in females. If a mother has the trait, all of her sons should also have it. There is no male to male transmission. It has the same inheritance patterns as autosomal recessive for human females. The son of a female carrier has a 50 percent chance of having the trait. Mothers of males who have the trait are either heterozygous carriers or homozygous and express the trait.

Sex-linked Traits Draw Pedigree in your notebook and label the genotypes of the individuals. Remember shaded in means the individual is expressing the recessive trait.

X-Linked Recessive

Genetics Practice Write the questions in your notebook and use the chart to answer the questions. You will have to identify the individuals genotype, phenotype, or both for each question. Homozygous dominant for tail length = ____________ &___________ Heterozygous for eye color= ______&__________ Homozygous for small ears = ____________________ Hybrid for tail length= ___________&__________ Blue eyes = ____________________________ Purebred for solid gray fur=______________________

Punnett Squares