In a species of mouse, fur colour can be black or white. Two black female mice were allowed to mate with the same black male. One female had nine young, all of which were black. The other female had seven young, five black and two white. One of these white mice was male, and is allowed to mate with a heterozygous female. What is the expected ratio of phenotypes of their offspring?

Which statement correctly describes advantages or disadvantages of self-pollination to a plant?

A man is blood group A and his wife is blood group AB. What are the possible blood groups of their children?

Which of these may be heterozygous?

Which process does not require energy?

In a kidney machine, protein molecules are not lost from the blood. How is loss of protein prevented?

What happens when the body temperature of a human is controlled?