Question

1. Wool color in sheep is under the control of an autosomal gene which segregates two...

1.

Wool color in sheep is under the control of an autosomal gene which segregates two alleles: B,confers white wool, while the recessive allele b specifies black wool. A population of sheep under Hardy-Weinberg equilibrium was observed: Of 325 individuals, 194 have white wool and 131 have black wool.

.

What is the frequency of the B allele?

b.

How many of the 194 white sheep are expected to be heterozygous?

2. Cat coat color is controlled by an X-linked gene with two alleles: XB= Black and XO = Orange. A population of cats in Tampa was found to consist of the following phenotypes:

Black Orange Calico Totals
Males 311 42 0 353
Females 277 7 54 338

Calculate the allelic frequency using all of the available information.

Homework Answers

Answer #1

B represents dominant character, that codes for white wool and have 194 individuals.

b represents recessive character, that codes for black wool and have 131 individuals.

Let allelic frequency for B is represented as p in homozygous condition.

Therefore, Frequency for white wool = No.of individuals / Total no.of individuals

= 194 / 325 = 0.5969

Now, this means, BB = p2 = 0.5969

Therefore, p =

Thus, p = 0.7726

As we know, p + q = 1

0.7726 + q = 1

Thus, q = 0.2274

Frequency in Heretozygous condition = 2pq

= 2 X 0.7726 X 0.2274

= 0.3513

Now. according to question, we need to find no. of individuals who are heterozygotes among 194 white wool individuals, which is a dominant character.

Therefore, 194 X 0.3513 = 68.1522

Approx = 68 heterozygous individuals for wite wool among 194 total white wool individuals.

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