AP Biology Lab 3: Mitosis and Meiosis

Mr. Anderson introduces AP Biology Lab 3, focusing on mitosis and meiosis. The lab involves observing onion root cells to study mitosis and Sordaria fungus to understand meiosis and genetic crossover. Mitosis is described as the equal division of a diploid cell's nucleus, resulting in identical cells. Meiosis involves two divisions and crossing over, producing genetically unique haploid cells. The lab uses techniques to observe cell phases and calculate genetic crossover, providing insights into gene mapping.

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

• To observe the growth of onion roots

• To study the phases of mitosis

• To measure the length of onion roots

• To analyze the color of onion roots

During mitosis, what happens during metaphase?

• Chromosomes are pulled apart

• Chromosomes line up in the middle

• Chromosomes are duplicated

• Cells divide into four

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

• Meiosis produces cells with double the genetic information

• Meiosis does not involve crossing over

• Meiosis involves two rounds of division

• Meiosis results in identical diploid cells

What is the significance of crossing over in meiosis?

• It doubles the chromosome number

• It prevents cell division

• It creates genetic diversity

• It results in identical chromosomes

What are meristems in the context of this lab?

• Animal stem cells

• Indeterminate plant cells

• Mature plant cells

• Cells that have decided their function

How is the percentage of crossover calculated in the lab?

• By subtracting the crossover percentage from 100

• By adding the crossover percentage to 100

• By multiplying the crossover percentage by 2

• By dividing the crossover percentage by 2

What does a 25 map unit distance indicate about gene location?

• Genes are on different chromosomes

• Genes are identical

• Genes are far apart

• Genes are very close together