BIO220H1 Lecture Notes - Lecture 1: Inbreeding Depression, Litmus, Autosome

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Published on 14 Jan 2020
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BIO220 Notes Lec 1
Genome data
mtDNA maternal lineage
Y chromosomes paternal lineage
Autosomes both paternal/maternal
Genetic markers evolutionary process
Genetic data of behavior and ecology patterns in data
Uniparental inherited
(mt, Y)
Biparentally
(autosomes, X)
all members of the population
(mt, autosomes, X)
In ½ of population
(Y)
Observation 1: Fluid Social System in Elephants
Q: Do male elephant avoid inbreeding?
H: 1) yes, inbreeding depression
2) no, weak inbreeding depression, natural selection not selected, or reproductive success is
variable
*experiments with elephants: lifespan too long, gestation too long, unable to measure inbreeding
depression.
Litmus test:
- Observe elephant behavior
- Quantify mating behavior
- Paternity requires genetic
Possible results:
-No difference
-Inbreeding preference
-Inbreeding avoidance
Result: elephants avoid their kin. Male elephant will avoid reproducing with their sisters on their
father’s side.
Summary:
- Male reproductive successes are arbitrary; therefore, they would want to mate as many as
possible, avoid inbreed will be expensive. However, they do avoid inbreeding
- The fitness of male elephants is low; competition for mating, fights that are deadly.
- Female elephants have choices on matting with whom.
Autosomes:
-Low recombinant gene inherited as one unit.
-High recombinant gene; inherited independently
Use genetic markers!
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