Please Help me ? I will greatly appreciate it so much!!:) (Week before finals. I

Question

Please Help me ? I will greatly appreciate it so much!!:) (Week before finals. I must do well to pass.)

1.If 5 out of 100 mice migrated from a large field (mainland) to a barn (island) and the frequency of the A allele in the field was 0.67 and the frequency of the A allele in the barn was 0.46, what would the frequency of the A allele in the barn be after 1 generation of migration? E) 0.46 IS MY EDUCATED GUESS?

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2. Consider a population of frogs. Allele B1codes for spotted frogs; allele B2codes for non-spotted frogs. B1is dominant to B2.

The allele frequencies on the mainland are B1 = 0.75 and B2 = 0.25.

The allele frequencies on the island are B1= 0.55 and B2 = 0.45. There are 170 frogs on the island.

During a storm, 30 non-spotted frogs come to the island by floating on debris. What are the new frequencies of B1and B2on the island?

Enter your answer as two numbers (each to two decimal places), separated by a comma. (Example: 0.56, 0.44) 0.43,0.57  IS MY EDUCATED GUESS?

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3. A population of chickadees was sampled and individuals were genotyped for the Adhlocus. The following data were collected:

A1A1 12
A1A2 17
A2A2 5
A2A3 8
A1A3 10
A3A3 3

Part A

What are the allele frequencies of the A1, A2, and A3 alleles (in that order)?

A) 0.709, 0.545, 0.382

B) 0.355, 0.273, 0.191

C) 0.464, 0.318, 0.217

D) 0.355, 0.318, 0.327

Part B

What are the genotype frequencies of A1A1, A1A2A1A3 (in this order)?

A) 0.464, 0.318, 0.218

B) .218, 0.309, 0.182

C) 0.091, 0.145, 0.309

E) 0.218, 0.318, 0.464

Part C

Assuming that this locus is neutral, if this population suddenly became isolated and inbreeding became common, what might happen to the allele and genotype frequencies after many generations?

A) Allele frequencies may stay the same but homozygosity would increase and heterozygosity would decrease.

B) Allele frequencies may stay the same but heterozygosity would increase and homozygosity would decrease.

C) Allele frequencies would go up and genotype frequencies would go down.

D) Allele frequencies would go down and genotype frequencies would go up.

Explanation / Answer

(1)

D) 0.4705

large field (mainland): A = 0.67 a = 0.33

AA = 0.45 Aa = 0.44 aa = 0.11

Barn (Island): A = 0.46 a = 0.54

AA = 0.212 Aa = 0.5 aa = 0.29

The frequency of the A allele in the barn be after 1 generation of migration

p’ = (1-m) (pI) +(m)(pM)

m=5/100=0.05

p’ = (1-0.05) (0.46) + (0.05)(0.67) = 0.437+0.0335=0.4705

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