Interesting Facts (don't tell me definition cuz I already know it) about xylem, at least one

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.

Explain how scientists use geologic time to determine the age of landforms.