non-mendelian and pedigrees

SRY gene meaning

Sex-determining Region on the Y-chromosome

SRY gene (pleiotropy)

causes fetal gonads to develop as testes after fertilization

What does testosterone cause

male physical/behavioral traits

Linked traits

genes close on chromosomes are linked if crossing doesnt happen

Genes close on chromosomes have

higher chance of being inherited

Sex-linked traits

influenced by genes on sex chromosomes

Pedigrees

used to figure out and predict inheritance

◻

male unaffected

○

female unaffected

◼

male affected

⏺ 

female affected

Autosomal Dominant

2 affected can’t have unaffected

Autosomal Recessive

2 unaffected cant have affected

You are breeding miniature schnauzers. You breed a black female with a blond male and all of the pups are gray. This is an example of what type of inheritance?

incomplete dominance

Your mom has light blond hair while your dad has brown hair. You have blond hair, your sister has dirty blond hair and your brother has light brown hair. That is, your family is a rainbow of hair color! This is an example of what type of inheritance?

polygenic trait

What might happen if an individual inherited a
recessive (and disfunctional) mutation in SRY?

an XY male might display female sex traits

Which law does linked traits violate?

law of independent assortment

The disorder shown on the pedigree is Maple Syrup Urine Disease (MSUD) which is a metabolic disorder that affects the body’s ability to process certain proteins. It was named after a distinctive odor of a baby’s urine. What is the inheritance pattern of this gene?

autosomal recessive