Sex–Linked InheritanceMrs. StewartHonors BiologyCentral Magnet School

Sex – Linked TraitsMale and Female genotypes

Who determines the sex of the baby?

What allele will mom pass on to baby?

Hint: There’s only one possible

What allele will dad pass on to baby?

So, who ultimately determines the sex of baby?

How is sex determined?

X

Y

Not just sex determinationThe X and Y chromosomes

contain the genes that determine male or female sex characteristics

BUT WAIT, THAT’S NOT ALL!

The X chromosome contains alleles for other characteristics

The X-Chromosome

HemophiliaColor blindnessBaldnessDuchenne

Muscular Dystrophy

These X-linked recessive disorders will predominantly affect males. Why?

Pipe Cleaner Babies Activity