Intro to Meiosis

Introduction to meiosis

Let's Review: What is mitosis used for?

Repair Growth

Mitosis is how identical somatic (body) cells are produced. This process is asexual.

Dropdown

Mitosis is associated with ​

Select answer

reproduction because when the cell divides, it makes a cell that is ​

Select answer

.

Multiple Select

Which of the following cells undergo mitosis?

• Liver cells

• sperm

• hair cells

• eggs

• skin cells

Meiosis is how sex cells (eggs and sperm) are produced. This process is sexual reproduction.

Multiple Select

Which of the following cells undergo meiosis?

• Liver cells

• sperm

• hair cells

• eggs

• skin cells

Our body cells need 46
chromosomes. If humans
reproduce sexually with 2
“parents”, how many
chromosomes do you think are in each sex cell?

●

The sperm carries 23
chromosomes, and the egg
carries 23 chromosomes. These sex cells are haploid cells. They contain HALF of the DNA we need.

●

Fertilization occurs when sex cells combine to to produce body cells with 46 chromosomes. These body cells are diploid cells. They contain ALL the DNA we need.

Haploid and Diploid

Drag and Drop

The male sex cell is called ​

Placeholder

​ and it contains ​

Placeholder

chromosomes. This means that it is ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

sperm

23

haploid

diploid

46

egg

somatic

Drag and Drop

The female sex cell is called ​

Placeholder

​ and it contains ​

Placeholder

chromosomes. This means that it is ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

egg

23

haploid

diploid

46

somatic

sperm

Drag and Drop

​

Placeholder

contain ​46 chromosomes. This means that it is ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

Body Cells

diploid

haploid

Sex cells

Drag and Drop

When the sperm combines with the egg, it is called ​

Placeholder

. When fertilization happens, the ​

Placeholder

chromosomes from the sperm and the ​

Placeholder

chromosomes from the egg combine to give our cells ​

Placeholder

chromosomes total.

Drag these tiles and drop them in the correct blank above

fertilization,

23

46

46

Mitosis

46

46

How many body cells does one cell
produce in mitosis?

How many chromosomes do body cells
have?

Are the daughter body cells going to
be identical or different from the
parent cell?

Meiosis

46

23

23

23

23

23

23

In meiosis, a cell must divide twice in order to produce sex cells.

If this is sexual reproduction, should these 4 daughter cells be identical or different?

Division I

Division II

Multiple Choice

In mitosis, there is one division. How many divisions are there in meiosis?

• 1

• 2

• 3

46

Mitosis

46

46

Meiosis

46

23

23

23

23

23

23

Compare and

contrast

Drag and Drop

At the end of mitosis, there are ​

Placeholder

daughter cells with ​

Placeholder

chromosomes because mitosis makes more body cells.

Drag these tiles and drop them in the correct blank above

2

46

4

23

Drag and Drop

At the end of meiosis, there are ​​

Placeholder

daughter cells with ​​

Placeholder

chromosomes because meiosis makes more sex cells.

Drag these tiles and drop them in the correct blank above

4

23

2

46

Meiosis

Interphase

Prophase I

Metaphase I

Anaphase I

Telophase I

Prophase II

Metaphase II

Telophase II

Anaphase II

Mitosis Meiosis

Open Ended

What is one big difference between mitosis and meiosis?

In Meiosis, chromosomes do something called crossing over. This is when DNA from each parent mix together to make unique offspring.

(like you!)

Dropdown

Crossing over happens in ​

Select answer

and results in ​

Select answer

offspring.

Mitosis Meiosis

Multiple Choice

If the diploid chromosome number for a fruit fly is 8, then what is the haploid chromosome number?

• 8

• 4

• 2

• 3