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Sex–Linked Inheritance. Mrs. Stewart Honors Biology Central Magnet School. Sex – Linked Traits Male 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?
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Sex–Linked Inheritance Mrs. Stewart Honors Biology Central Magnet School
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 determination • The 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 • Hemophilia • Color blindness • Baldness • Duchenne Muscular Dystrophy • These X-linked recessive disorders will predominantly affect males. Why?