Vocabulary: anaphase, chromosome, crossover, cytokinesis, diploid, DNA, dominant, gamete,genotype,

germ cell, haploid, homologous chromosomes, interphase, meiosis, metaphase, mitosis, ovum,

phenotype, prophase, recessive, sister chromatid, sperm cell, telophase, zygote

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. During mitosis, a single cell divides to produce two daughter cells. What must happen inthe

original cell so that each of the daughter cells has a complete set of chromosomes?

The DNA must replicate

2. During sexual reproduction, two sex cells fuse to create a fertilized cell with a complete setof

chromosomes. What must be true about the number of chromosomes in each sex cell?

There must be 2 one x and one y or both X.

Gizmo Warm-up

Meiosis is a type of cell division that results in four daughter cells

with half as many chromosomes as the parent cell.

These daughter cells mature into gametes, or sex cells. In the

Meiosis Gizmo, you will learn the steps in meiosis and

experiment to produce customized sex cells and offspring.

On the STEPS tab, click Male. You are looking at a germ cell,

or a cell that will undergo meiosis to become gametes.

1. Read the description of at the bottom of the Gizmo. What happens to the cell at

the beginning of interphase? The cell grows in size and doubles its organelles