7 - Unit 1, Section 4 - Day 1

Mitosis and Meiosis

Unit 1, Section 1

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REVIEW TIME! A

is a cell that does not have a nucleus.

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REVIEW TIME, PART 2! A

is a cell that has a nucleus.

• Organisms reproduce, which means they make copies of themselves

• That means cells themselves have to reproduce

• How do you think that happens?

Think-Pair-Share

Open Ended

Discuss the following question with your partner and answer it: How do you think a cell reproduces?

Open Ended

What part of a cell do you think must be copied first?

Chromosome - a tightly-packed molecule that contains all, or part, of an organism's DNA

• Every organism has a certain number of chromosomes in their cells

• Different chromosomes have a different percent of DNA

Chromosomes

• Most human cells have 23 pairs of chromosomes

• That's 46 chromosomes in total!

Human Chromosomes

Cell Division - the process of cell reproduction

• One cell creates daughter cells that have the genetic information of the parent cell

• There are two types of cell division:

  • Mitosis

  • Meiosis

Cell Division

Mitosis and Meiosis: The Basics

​	​Mitosis	Meiosis​
​Purpose	Growth, Repair, Replacement of Dead Dells​	​Production of Gametes for Sexual Reproduction
Chromosomes in Parent Cell​	23 Pairs (46 Total)​	23 Pairs (46 Total)​
Chromosomes in Daughter Cell​s	23 Pairs (46 Total)​ - Diploid	23 Total (Not in Pairs) - Haploid
Number of Daughter Cells​	​Two	Four​
Daughter Cells:​	Are Genetically Identical to Parent Cells​	Are Not Genetically Identical to Parent Cells

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A

is a tightly-packed molecule that contains all, or part of, an organism's DNA.

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Most human cells have

pairs of chromosomes.

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The purpose of

is for growth, repair, and replacement of dead cells.

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The purpose of

is to produce cells used in sexual reproduction.