In order to ensure that he had pure-breeding plants for his experiments, Mendel:

A gene is a:

A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell

(Sperm or ovum) of a human being is most likely to be:

In the human blood grouping, the four basic blood types are type A, type B, type AB, and type 0. The blood proteins A and B are:

A plant with two 'small' genes breeds with a plant with two 'tall' genes to produce: