Question

You have three genes on the same chromosome - A, B and C. Each gene has two alleles in a dominant/recessive relationship. For these genes the homozygous recessive has the mutant phenotype for that trait, the dominant phenotype = wild type for that trait.

• allele A is dominant to a; phenotype a = mutant for trait a; phenotype A = wild type for trait A
• allele B is dominant to b; phenotype b = mutant for trait b; phenotype B = wild type for trait B
• allele C is dominant to c; phenotype c = mutant for trait c; phenotype C = wild type for trait C

Note: phenotypes can be represented by single letters. For example phenotype A = genotypes Aa or AA; phenotype a = genotype aa. Assume that phenotype ab = mutant phenotype for traits a and b, and wild type phenotype for trait C.

You cross an individual heterozygote for all three genes, with an individual who is homozygote recessive for all three. Out of 10,000 offspring you get the following phenotypes and amounts:

• phenotype a - 98
• phenotype b - 150
• phenotype c - 4751
• phenotype ab - 4749
• phenotype ac - 147
• phenotype bc - 99
• phenotype abc - 3
• wild type - 3

Use this information to answer the following questions.

Q. Given the information at the top of the page, determine the recombination frequency for A-C. Show your work here!

Note: You will choose the correct answer in the question below (multiple choice). This is for you to show your work.

You can show your work by typing out the math (fractions, % or decimals; can use any format you like) or explaining how you found the answer in words, or a combination of both. Basically any description/showing of your work even if your answer is wrong = 2 marks.

Given the information at the top of the page, what is the recombination frequency for A-C? Frequency is given as a number from 0 to 1.

Select one:

a. 0.02

b. 0.03

c. 0.015

d. 0.1

e. 0.05

Answer 1

Qocombination frequency. - Number of Recombinants That offering Recombination between A-cs ac =147,1 b = 150 F7 303 DCO = 3+3. 30, 303 vu: 10,000 = 0.03 Hence, the correct answer is option [b], 0.03