You cross an individual with gygy to another with gygy and g

You cross an individual with g\'y/gy^+ to another with gy/gy and get the following g^+ g y y 600 g g y^+ y 553 g^+ g y^+ y 405 g g y y 470 Which are parental? Which are recombinants? What is the expected # of individuals for each group? What is the null hypothesis? Are these two genes linked?

Solution

1. 3 & 4 are parental, because of their genotypes are similar to parents g+y/gy+ or g+gy+y & gy/gy or ggyy

2. 1 & 2 are recombinants because their genotypes are different to the parents: g+gyy or g+y/gy and ggy+y or gy+/gy.

3. A null hypothesis is a statistical hypothesis that is tested for possible rejection under the assumption that it is true (usually that observations are the result of chance). The concept was introduced by R. A. Fisher.

4. The two genes are non linked. If linked, the recombinant characters always lessthan 50% of the total progeny