GENETICS QUESTION - PLS HELP On the planet Trellus, in the Rayban region, the mo

ID: 176990 • Letter: G

Question

GENETICS QUESTION - PLS HELP

On the planet Trellus, in the Rayban region, the mountain lion species Totalis Frigus has certain physical attributes determined by three loci:

Gene Alferiore (Allele A = mutant; tremendous body strength; allele a = standard body strength).

Gene Bingenti (Allele B = mutant; tremendous speed; allele b = standard speed).

Gene Cakratuv (Allele C = mutant; exceptional long range vision; allele c = standard vision).

Note each capital letter is dominant to each lower case letter. Also, we can have homozygous dominant phenotypes (i.e, no heterozygous lethal).

In a mating of a true breeding Totalis Frigus lion with tremendous strength, tremendous speed, and exceptional long range vision, with a true breeding Totalis Frigus lion with standard attributes for all, is it possible to offspring counts as in the following table?

Note: Litters among Totalis Frigus lions are very large, typically.

Yes, if Gene Alferiore is in the middle and:
1. Recombination fraction between Alferiore and Bingenti is close to 0.40;

2. Recombination fraction between Alferiore and Cakratuv is close to 0.40.

B. No, it is not possible.

Yes, Gene Bingenti is in the middle:
1. Recombination fraction between Bingenti and Alferiore is near 0.40;

2. Recombination fraction between Bingenti and Cakratuv is near 0.40.

Yes, if Gene Alferiore is in the middle and:
1. Recombination fraction between Bingenti and Alferiore is close to 0.40;

2. Recombination fraction between Alferiore and Cakratuv is close to 0.50.

Yes, if Gene Bingenti is in the middle and:
1. Recombination fraction between Alferiore and Bingenti is close to 0.0;

2. Recombination fraction between Bingenti and Cakratuv is close to 0.0.

Haplotypes Counts abc 193 ABC 159 AbC 58 aBc 64 ABc 111 abC 113 Abc 144 aBC 138

Explanation / Answer

C). Yes, Gene Bingenti is in the middle:
1. Recombination fraction between Bingenti and Alferiore is near 0.40;

2. Recombination fraction between Bingenti and Cakratuv is near 0.40.

Haplotypes

Counts

abc

193 --à Parental

ABC

159 --à Parental

AbC

58 à Double crossover

aBc

64 à Double crossover

ABc

111 à Single crossover between B and C

abC

113 à Single crossover between B and C

Abc

144 à Single crossover between A and B

aBC

138 à Single crossover between A and B

from the double crossover and single crossover gametes, we can say that the gene order is ABC.

Now, distance between A and B

= number of gametes produced by single crossover of A and B + number of double crossover gametes*100/ total number of gametes.

= (144+138+58+64)*100/ 980 = 2000/200 = 41.22 map units.

Now, distance between B and C

= number of gametes produced by single crossover of B and C + number of double crossover gametes*100/ total number of gametes.

= (111+113+58+64)*100/ 980 = 35.3 map units.