Two linked genes, A and B, are separated by 20 cM. A man with genotype AB/ab marries a woman who is ab/ab. What is the probability that their first child will be Ab/ab?

Explanation:

Given:

man  AB/ab

woman ab/ab

gene distance  20 cM

Genetic distances within a given linkage group  are measured in centiMorgans.

Children will be AB/ab, Ab/ab, aB/ab and ab/ab

Here , as given gene distance is 20 cM, so the recombination frequency is 20%.

So the frequency of recombinant progeny is 20 %.

The the probability that their first child will be  Ab/ab is  10%.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion