AP Biology Lab: Mitosis and Meiosis

Mr. Anderson introduces AP Biology Lab 3, focusing on mitosis and meiosis. The lab involves observing cell division in onion roots to understand mitosis phases and using sordaria fungus to study genetic crossover in meiosis. Mitosis is explained as the equal division of the nucleus, resulting in identical diploid cells. Meiosis involves two divisions and genetic crossover, producing haploid cells with unique genetic combinations. The lab procedures include counting cell phases in mitosis and analyzing spore patterns in meiosis to determine crossover frequency.

What is the primary objective of the lab involving onion roots?

• To observe cell division and calculate time spent in each mitosis phase

• To identify different types of fungi

• To measure the length of onion roots

• To observe the growth of onion roots

During mitosis, what happens to the DNA before the cell divides?

• It is halved

• It is destroyed

• It remains unchanged

• It is duplicated

What is the result of mitosis in terms of the cells produced?

• Two different haploid cells

• Four identical haploid cells

• Four different diploid cells

• Two identical diploid cells

How does meiosis differ from mitosis in terms of cell division?

• Both involve one division

• Both involve two divisions

• Meiosis involves two divisions, mitosis involves one

• Meiosis involves one division, mitosis involves two

What unique genetic feature is produced during meiosis?

• Identical chromosomes

• Only dominant genes

• No genetic variation

• Unique genetic combinations

In the mitosis lab, what is the purpose of counting cells in different phases?

• To measure cell temperature

• To identify cell types

• To calculate the time spent in each phase

• To determine the size of the cells

What is the significance of the 73.8% time spent in interphase during mitosis?

• It means cells are inactive

• It indicates rapid cell division

• It shows the majority of the cell cycle is spent in interphase

• It suggests errors in cell division

In the meiosis lab, what does a 2:2:2:2 spore pattern indicate?

• Cell death occurred

• No crossover occurred

• Crossover occurred

• Mutation occurred

How is the frequency of crossover calculated in the sordaria lab?

• By counting the number of spores

• By measuring spore size

• By dividing the crossover percentage by two

• By observing spore color

What does a map unit represent in genetic mapping?

• The weight of a gene

• The number of genes

• The distance between genes

• The size of a chromosome