Two genes of a flower, one controlling blue (b) versus white (b) petals and the other controlling round (r) versus oval (r) stamens, are linked and are 10 map units apart. you cross a homozygous blue oval plant with a homozygous white round plant. the resulting f1 progeny are crossed with homozygous white oval plants, and 1,000 offspring plants are obtained. how many plants of each of the four phenotypes do you expect?

If we cross a homozygous blue oval plant with a homozygous white round plant

P: BBrr  x  bbRR

The resulting F1 progeny:

F1: BbRr

If we cross BbRr with bbrr

F2: 1/4 blue round plants (250 plants) ¼ blue oval plants (250 plants)  ¼ white round  plants (250 plants) and ¼ white oval plants (250 plants).

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms