### What is the EXPECTED number of each genotypic class under the hypothesis that th

In class on January 20, we did an exercise in which we simulated the production of gametes from an individual with genotype AaBb), and generated offspring by mating with another AaBb individual.  We obtained the following numbers of offspring.  (NOTE:  this is after correcting the i-clicker data for duplicate offspring.)

Genotypic Class Observed number

A-B-          43

A-bb      14

aaB-      9

aabb        7

TOTAL:          73

Part A

What is the EXPECTED number of each genotypic class under the hypothesis that the two genes show equal segregation of alleles and independent assortment?

 A-B- = 10.75; A-bb = 3.50; ﻿aaB- = 2.25; ﻿aabb﻿ = 1.75 A-B- = 18.25; A-bb = 18.25; aaB- = 18.25; aabb = 18.25 A-B- = 24.1875; A-bb = 2.625; ﻿aaB- = 1.6875; ﻿aabb﻿ = 0.4375 A-B- = 41.0625; A-bb = 13.6875; ﻿aaB- = 13.6875; ﻿aabb﻿ = 4.5625

Part B

The Chi-square test statistic on these data would have how many degrees of freedom?

 1 72 4 3

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