Handouts and Homework

Question 1

How long after Darwin’s 2 books(“On the Origin..” , “descent of Man…”) did the 1st peerreviewed studies appear on natural and sexual selection? What organism was each 1st study about?
Natural selection: How long? What organism?
Sexual Selection: How long? What organism?

Answer 1

Nat. Sel:

Sex. Sel: 74 years after with Dragonflies

Question 2

Most cases of speciation by naturak sekection involved ____(organisms) and the nature of divergence driving speciation is/was_____.

Answer 2

insects

Plant host divergence

Question 3

On haplodiploidy(eusociality):

a. males are more closely related to their_____ (0.75) than their _____(0.5) because their father is _____(ploidy) and makes sperm by _______.
b. Name one group of organisms that have adopted this system.

Answer 3

a. \_\_\_\_\_
\_\_\_\_\_
\_\_\_\_\_
Mitosis
b. Ants

Question 4

In a study of enzyme variability in a beetle, you found the following obesrved allele frequencies at one locus: A1=0.60, A2=0.25, A3= 0.15. Show your work:

a. what % of the population is made up of heterozygotes of all types?
b. In a sample of 100 individuals, how many would you expect to be homozygous A3A3?

Answer 4

a. ____

b. (0.15)(0.15)*100=2.25=2 individuals