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Lecture 15

BIOL 1001 Lecture Notes - Lecture 15: Lek Mating, Assortative Mating, Allele Frequency


Department
Biology
Course Code
BIOL 1001
Professor
Alexander Mills
Lecture
15

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Wednesday, February 15, 2017
Non-Random Mating
-often doesn’t change the allele frequencies
-Mating usually isn't non random
-sexual selection is a category of NS
Inbreeding
-the genetic result of inbreeding increases in the #of loci that are homozygous
the negaitive impact of this is that homozygous with deleterious alleles
-Remember that recessive alleles aren't necessarily bad
-Siblings can breed in small pop (snake example)
when they are both heterozygotes it is very likely that their offspring will be
homozygous
in contrast outbreeding
-the rare recessive is less likely to show up in the offspring
-Increase homozygosity
stats say that more likely to have offspring that are homozygous
-If the result is negative then there will be NS
inferior allleles will be removed
-Royal Linage
Red is uncle niece marriage
blue is cousin marriages
consanguineous means marriage within the family
Charles II of Spain
-had lots of problems
was more likely to be homozygous for bad alleles
-family tree comes in when it should spread out
-Many recessive alleles codes for a nonfunctional protein (heterozygotes will be
normal and still make the protein and the homozygotes have no functional protein)
!1
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