Biology 1001A Lecture 12: LEC 12 - Inheritance in Populations.pdf
11 Feb 2014
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Section 10. 2a in incomplete dominance, dominant alleles do not completely. Skim section 16. 1 but have good read of section 16. 2. We will be using the mendelian pigs simutext module. Have a look in advance if you have time and bring it along to class if you like. Incomplete dominance (id): effect of recessive alleles can be detected to some extent in heterozygotes e. g. true-breed red and white snapdragon flowers crossed, all offspring pink. When 2 pink snapdragons cross, there are red, pink, and white offspring ~ Person w/ disease is homozygous for recessive allele the codes for defective form of a polypeptide on hemoglobin molecules. Heterozygous for allele produces normal and defective polypeptide. Incomplete dominance not always visible e. g. flower may have id for pigment, but would appear same as homozygous flower. Section 10. 2b in codominance, the effects of different alleles are equally. Codominance: alleles have approx. equal effects, alleles are equally detectable in heterozygotes.
