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You have a cup of beans in front of you with 20 white beans and 24...

You have a cup of beans in front of you with 20 white beans and 24 red beans. These beans represent the alleles for a simple Mendelian trait, where red is dominant (R) and white is recessive (r).
In 1997, a self-isolated group of people living on a small island was joined by a group of explorers from a nearby island.
STEP 1. Create the original, self-isolated population. The self-isolated population consists of six males. Three of them are homozygous recessive, two are heterozygous, and one is homozygous dominant. Pull out the appropriate genotypes and set them in front of you. Answer the following two questions about this self-isolated population.
How many recessive alleles are present in this self-isolated population?

5

6

8

12

Question 2
How many dominant alleles are present in this self-isolated population?

2

3

4

8

Question 3
STEP 2. Create the explorer population, keeping the males and females separate. The explorer population consists of two males and eight females, all of whom are homozygous dominant for the same Mendelian trait. Answer the following two questions about this explorer population.

How many recessive alleles are present in this explorer population?

0

4

10

16

20

Question 4
How many dominant alleles are present in this explorer population?

0

4

10

16

20

Question 5
STEP 3. Create the descendant population. Everyone on the island found their perfect mate and decided to have two children. Being sure to keep the male and female alleles separate, mix up the male alleles together, and mix up the female alleles together. Create the next generation by taking one allele from the males and combining it with one allele from the females until 16 new individuals (pairs of alleles) are sitting in front of you. Record their genotypes in the table on p. 96 of your lab manual. Answer the remaining questions in this exercise about this descendant population.
How many recessive alleles are present in this descendant population?

0

8

16

20

24

Question 6
How does this vary from the number of recessive alleles present in the explorer population?

The number of recessive alleles has increased

The number of recessive alleles has decreased

There has been no change

Question 7
How many dominant alleles are present in the descendant population?

4

0

24

20

32

Question 8
How does this vary from the number of dominant alleles in the original, self-isolated population?

The number of dominant alleles has increased

The number of dominant alleles has decreased

There has been no change
Question 9
What long-term effects can gene flow have on any two populations that are exchanging genes?

All of these

It can introduce previously unknown genetic material

It can make two populations more similar to one another

It can shift allele frequencies
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Homework Answers

Answer #1

Question 1 :- 8 recessive alleles are present in this population

Question 2 :-   4 dominant alleles are present in this population

Question 3 :-   0 recessive alleles are present

Question 4 :-   20 dominant alleles are present in this population

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