This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: X R r o R RR Rr o r Rr rr Mendel’s Law of Segregation-the separation of alleles during reproduction of sex cells, allowing maintenance of their separate identities and later full expression of their traits Mendel’s Law of Independent Assortment-The inheritance of characteristics in one offspring does not influence the inherited characteristics in subsequent offspring Dominant Traits-Achondroplasia Dwarfism o Caused by one change in one chemical base o 1 in 100,000 live births o Average sized body trunk o Shortened limbs o 80% born to average sized parents o Once inherited it can be passed on Dwarf X Average Stature- X D d- d Dd dd- d Dd dd Dwarf X Dwarf- X D d- D DD Dd- d Dd dd Recessive Traits-albinism-1 in 37,700 births-no melanin produced in skin, hair, or iris-found throughout the world-high incidence of skin cancer Heterozygous Parents- X A a- A AA Aa- a Aa aa- 25% homozygous dominant- 50% heterozygous- 25% homozygous recessive...
View Full Document
- Fall '03
- Genetics, dd dd, homozygous recessive- dd