Genetics Please answer part A and B of this question A B Sup

Genetics: Please answer part A and B of this question

A)

B)

Suppose a and b are recessive alleles of genes located 20 map units apart on the same chromosome in pea plants. True-breeding plants are mated to true-breeding +b plants, and the heterozygous a +/4 b plants that are produced are then test-crossed What proportion of plants with the double recessive a b phenotype are expected in the progeny of this testcross? 1% 10% 40% 29% 20%

Solution

answer:

Generally we calculate ----

Map distance = double recessive group * 100/total no. Of individuals

So, double recessive gr.= map distance*total no of individual/100 , is the desired calculation. However, total number if individual is missing.