Question

when you study heredity, you need to be able to compare generations. in this lab, you will compare different generations of mice. the original mice that you cross are called the dropdown. the offspring from that cross are called the dropdown. done

Explanation:

In genetics, the original pair of organisms that are crossed in an experiment are known as the parental generation, or P - generation. The offspring resulting from this cross are called the first - filial generation, or F1 generation.

Answer:

The original mice that you cross are called the P - generation.
The offspring from that cross are called the F1 generation.