4 Key Concepts Diploid/Haploid

Example Sperm (_______) Egg (_______) Zygote (_______)

Example 3 3 Sperm (_______) haploid Egg (_______) haploid Mom Dad 6 Zygote (_______) Diploid

A Kangaroo has 6 chromosomes in its sperm cells A Kangaroo has 6 chromosomes in its sperm cells. Draw a picture of what the sperm and egg would look like. Draw a picture of the zygote

Kangaroo Sperm (_______) Egg (_______) Zygote (_______)

6 6 Sperm (Haploid) Egg (Haploid) 12 Zygote (Diploid)

A Fruit Fly has 8 chromosomes in a diploid zygote cell of its body A Fruit Fly has 8 chromosomes in a diploid zygote cell of its body. Draw a picture of the zygote Draw a picture of what the sperm and egg would look like.

Fruit Fly Sperm (_______) Egg (_______) Zygote (_______)

4 4 Sperm (Haploid) Egg (Haploid) 8 Zygote (Diploid)

Cell Cycle

Video

Cell Division Why would a cell need to divide? 1. Cells divide to cause growth

Cell Division Why would a cell need to divide? 2. Cells divide to replace dead or damaged cells

“The Cell Cycle and Interphase” Pg. 155 G1 Read the section “The Cell Cycle and Interphase” Then write what occurs in each section of the cell cycle (Write directly in your drawing) Cytokinesis S Mitosis G2

Cell prepares to divide Pg. 155 G1 Cell grows bigger Cytokinesis Replicate (make a copy) of DNA (chromosomes) S Mitosis Cell prepares to divide G2

Add these checkpoints to your picture

1 chromosome copied Sister chromatids- exact copies of each other Centromere- the spot where 2 sister chromatids hold together Centromere Sister chromatid Sister chromatid

Homologous Pairs Copied How are sister chromatids different from homologous pairs? Dad Mom Homologous Pair

Cell prepares to divide Pg. 155 G1 Cell grows bigger Replicate (make a copy) of DNA (chromosomes) S M Cell prepares to divide G2

S phase occurs

S phase occurs