A B C D F G H I J K 1 Bb Bb BB bb Bb Bb BB BB Bb bb 2 Bb BB Bb bb BB BB bb BB Bb

ID: 224486 • Letter: A

Question

Instead of the whole group being one population, assume each column is a separate small population. Choose any column to work with (record below in “a”). What are the allele frequencies for this population?

To illustrate the effect of sampling error, randomly choose four numbers between 1 and 10 and record below in “b”. These are the animals that breed this year (the first and second mate; the third and fourth mate). If each pair has four offspring (with genotypes as expected for a Mendelian cross (record in “c” and “d”)), compare the allele frequencies of the population before mating and the population after mating which consists of the eight offspring of the two selected pairs (e). (4 points)

Column selected (A - J, left to right) = __________________________

How many BB genotypes are there in the group?_______________

How many Bb genotypes are in the group? ___________________

How many bb genotypes are in the group? ____________________

Allele Frequency for B allele?_______________

Allele Frequency for b allele? ___________________

4 random numbers selected = _________ ________ ________ _________

Mating 1: Cross between first and second breeding animals (obtained from first and second random number selected).

Including both the parents and offspring

How many BB genotypes are there in the group?_______________

How many Bb genotypes are in the group? ___________________

How many bb genotypes are in the group? ____________________

Allele Frequency for B allele?_______________

Allele Frequency for b allele? ___________________

Mating 2: Cross between third and forth breeding animals (obtained from third and forth random number selected).

Including both the parents and offspring

How many BB genotypes are there in the group?_______________

How many Bb genotypes are in the group? ___________________

How many bb genotypes are in the group? ____________________

Allele Frequency for B allele?_______________

Allele Frequency for b allele? ___________________

Compare the allele frequencies of the population before the mating and after (2 points).

Total Alleles

Before

Total from two matings

Frequency

Before

Total from two matings

Discuss the results from above:

Explanation / Answer

Column selected (A - J, left to right) = H

How many BB genotypes are there in the group?___2____________

How many Bb genotypes are in the group? ________2___________

How many bb genotypes are in the group? _________6___________

Allele Frequency for B allele?_______0.3________

Allele Frequency for b allele? _________0.7__________

4 random numbers selected = ____5_____ ____6____ ___7____ _____8____

Mating 1: Cross between first and second breeding animals (obtained from first and second random number selected).

Including both the parents and offspring

How many BB genotypes are there in the group?______0_________

How many Bb genotypes are in the group? ___________3________

How many bb genotypes are in the group? ___________3_________

Allele Frequency for B allele?_______3/12=0.25________

Allele Frequency for b allele? ________9/12=0.75___________

Mating 2: Cross between third and fourth breeding animals (obtained from third and fourth random number selected).

Including both the parents and offspring

How many BB genotypes are there in the group?_______1________

How many Bb genotypes are in the group? __________4_________

How many bb genotypes are in the group? _________1___________

Allele Frequency for B allele?_______6/12=0.5________

Allele Frequency for b allele? _________6/12=0.5__________

Compare the allele frequencies of the population before the mating and after (2 points).

Total Alleles

Before

Total from two matings

Frequency

Before

0.625

Total from two matings

27/48=0.5625

29/48=0.6041

the frequency is decreased because we got some new offspring in which there were less no of offsprings having B genotype as compared to the previous population.

In first case(5&6) we did a back cross.

In 2nd case (7&8) we did a simple mendelian cross between pure line dominant with a pure lie recessive offspring.

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A B C D F G H I J K 1 Bb Bb BB bb Bb Bb BB BB Bb bb 2 Bb BB Bb bb BB BB bb BB Bb

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A B C D F G H I J K 1 Bb Bb BB bb Bb Bb BB BB Bb bb 2 Bb BB Bb bb BB BB bb BB Bb

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