CELL DIVISION : MEIOSIS

Welcome students to our

Sir Lindzie Swain G. Domen

SCIENCE CLASS!

2 rounds of PMAT

1 round of PMAT

2 diploid cells

4 haploid cells

UNIDENTICAL TO PARENT CELL

Identical to parent cell

Body cells

Meiosis

Mitosis

Sex cells

DIVIDE AND CONQUER

Topic Of The Day

Sir Lindzie Swain G. Domen

CELL DIVISION:MEIOSIS

REVISIT

IT'sSCI-MULATIONtime!

4.Four daughter cells, each with half the chromosome number as the original parent cell (father and mother).

3. Two rounds of cell division (Meiosis I and Meiosis II)

2, • Reduces the chromosomes number in half from two sets (diploid) into a single set (haploid).

1. Involves sex cells (sperm cell and egg cell) or gametes.

MEIOSIS

MEIOSIS II

MEIOSIS 1

Cytokinesis

G1, s pHASE, G2

INTERPHASE

TII

AII

MII

PII

t1

A1

m1

P1

PHASES OF MEIOSIS P.M.A.T

IT'sSCI-MULATIONtime!

From the word “gamete” which means sex cells and “genesis” which means origin.

Testes

Ovary

Sperm Cell

Egg Cell

GAMETOGENESIS

• Derived from the word “sperma” which means “sperm” and “genesis” which means “origin”. • The production of sperm cells in the testes. • Meiosis produces four small cells of similar size called spermatozoa or sperm.

SPERMATOGENESIS

• Derived from the word oo- which means “egg” and “genesis” which means “origin”. • The production of egg cells in the ovary. • Meiosis I in the ovary, the cell will produce two cells -one big and one small (polar body) this polar body may or may not divide, if it does then 2 small cells are produced but will disintegrate. • Meiosis II in the ovary, produces one big and one small cell from the first big cell in the meiosis I.

OOGENESIS

Responsible for genetic variation.

Ensures the correct number of chromosomes to an offspring.

Why MEIOSIS important?

• Meiosis involves sex cells.
• Meiosis undergoes two rounds of PMAT (Meiosis I and Meiosis II)
• Meiosis results into differentiation and sexual reproduction of species.

• Meiosis results into genetic diversity.

SUMMARY

TRUEorFALSE

FALSE

TRUE

Meiosis is responsible for genetic variation and reproduction of species.

FALSE

TRUE

After meiosis 1, the cell will then enter again into the interphase (G1, S Phase and G2).

FALSE

TRUE

Humans have a total of 46 chromosomes in 23 pairs.

FALSE

TRUE

Gametogenesis is the production of body cells, such as skin cells, muscle cells and so on.

FALSE

TRUE

The purpose of crossing over during Prophase 1 is important in achieving genetic variation/diversity.

GREAT JOB!

DO YOU HAVE ANY QUESTIONS?

LINDZIE SWAIN DOMEN

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THANK YOU!Keep safe !

IDENTIFY THE PHASEs OF MEOSIS

differenriate Spermatogenesis and Oogenesis.

Define MEIoSIS, OOGENESIS AND SPERMATOGENESIS

Explain the significance of meiosis in maintaining the chromosome number.

LESSON OBJECTIVES

SCI-MULATION ofMEIOSIS