Bio 180 Lecture 16:01

Range of dominance complete incomplete codominance ex

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ships: 1. Range of dominance: complete incomplete codominance. Ex. Tay-Sachs 2. Nothing to do with abundance or fitness of alleles in population Ex. Polydactyly Multiple Alleles = Existence of more than two alleles of the same gene. - Most populations dozens hundreds alleles per locus. * Note: One individual cannot carry > 2 alleles at a time. Ex. Leaf patterns/coloration in White clover Ex. Human blood type determined 3 alleles: i (recessive) IA, IB (codominant) Generate 6 possible genotypes and 4 phenotypes: Pleitropy = When a single gene affects more than one phenotypic trait. Ex. Frizzle gene in chickens - feathers curl upward - abnormal body temperature - higher metabolic & blood flow rate - greater digestive capacity - lay fewer eggs Ex. Phenylketonuria (PKU) in humans - mental retardation - eczema - reduced hair and skin pigmentation Gene x Environment Interactions - Strong effect on phenotypes produced by most genes. Ex. Effect of food deprivation on growth. Ex. Fur color in Himalayan rabbits and Siamese...
View Full Document

This note was uploaded on 02/24/2014 for the course BIOL 180 taught by Professor Freeman during the Winter '07 term at University of Washington.

Ask a homework question - tutors are online