MBG 2040 Chapter : MBG2040 Module 3.2.pdf

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Module 3 cont"d: extensions of. Both males and females have these genes but the expression of these traits varies from males to females. Examples paaern baldness, horn size in caale. Pa)ern baldness seems to be a dominant trait in males. Paeern baldness: always use a superscript/subscript with sex- in uenced genes. B1 normal allele b2 paaern baldness allele. Pa)ern baldness seems to be a recessive trait in females. Two parents who are heterozygous for the paaern baldness allele marry. Both males and females have these genes. Only one sex expresses the trait. Examples - milk produc;on, gene;c condi;ons that e ect the development of the uterus, penis, ovaries, testes, mammary glands. Sex- limited traits: crypto- orchidism is a sex- limited trait, in dogs, crypto- orchidism shows autosomal recessive inheritance. Aa males have undescended testes. Accordion genes : trinucleo;de repeats found within certain genes can expand from one genera;on to the next.

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