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: 172837 • Letter: A

Question

A disaster occurs in the habitat of this animal. To simulate this event, a circle has been drawn over the animals that did not survive the disaster. Count the number of BB, Bb, and bb genotypes of those outside the circle and determine the allele frequencies for B and b (2 points). Note: If the circle touches any part of the animal genotype, consider it not a survivor.

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? ___________________

Explanation / Answer

Please find the answers below:

How many BB genotypes are there in the group?

Answer: There are total 11*10 or 110 groups in the punnet square. There are total 37 BB genotypes in the group. These can be counted manually.

How many Bb genotypes are in the group?

Answer: Out of 110 groups in total, there are 40 groups with genotype Bb in the punnet square.

How many bb genotypes are in the group?

Answer: There are total 33 groups with genotype bb in the punnet square (Check: 110- (40+37)).

Allele Frequency for B allele?

Answer: The frequency of allele B will be given by the total number of incidences BB occurs along with half the number of incidences that Bb occurs divided by the total number of genotype groups. This will count to ( 37 + 40/2)/110 or 57/110 or 51.8%.

Allele Frequency for b allele?

Answer: The total frequency of b allele will be given by the ratio of the number of occurences of bb along with half the number of occurences of bB, i.e. :

(33+40/2)/110

= 53/110 or 48.1%.

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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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