BIOL 1104 Lecture Notes - Lecture 15: Null Hypothesis
20 Apr 2020
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Back to our otters: sea otters were heavily hunted and in 1900 about 50 individuals were left in the wild. ***this is an example of the bottleneck effect (which means it may have been affected more/ what causes this effect is loss of alleles, so the proportion of heterozygotes for any location will diminish. Genotypes (number of individuals) at one locus of sea otters in. S=16 (16 otters that are homozygotes), multiply by 2 cuz 2 copies of. 7 are the heterozygotes divided by 66 copies (33 pairs so 2 copies) Testing for hw equilibrium using a chi-square test. X^2= 10, this value is higher than 5% so we can reject the null hypothesis, so we can even say that we can reject it with a confidence value of 1% because 10 is larger than 1%. Rejecting the null deviates from the expectation because null= same as the expected, so it"s not the same as expected value.
