In both american cotton (gossypium hirsutum) and egyptian cotton (g. barbadense) petal spot is a dominant character over no petal spot. when the cross is made within the species, the f2 progeny segregates in a 3: 1 ratio with petal spot character in 75% of the population. however, no clear cut ratio is obtained in respect of the same flower character, when the cross is made reciprocally between the above two species. what is the explanation of this fact?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Describe how alleles and genes are related

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas