4 Key Concepts DiploidHaploid Example Sperm Egg Zygote

4 Key Concepts Diploid/Haploid

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

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

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. 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

G 1 Cyto kine sis S s i s o t i M G 2

G 1 Pg. 155 Cell grows bigger Cyto kine sis Replicate (make a copy) of DNA (chromosomes) Mitosis Cell prepares to divide G 2 S

Add these checkpoints to your picture

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

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

G 1 Pg. 155 Cell grows bigger Replicate (make a copy) of DNA (chromosomes) M Cell prepares to divide G 2 S

S phase occurs

S phase occurs