Sciences - Co-ordinated (9-1) - 0973 CIE

Cell Division

Gbogbo ọrọ náà

You began as one cell, and now you are made of trillions, all carrying the same genetic information. The process that copies a cell exactly, again and again, is mitosis. It is how you grow, how wounds heal, how worn-out cells are replaced, and how many organisms reproduce without a partner.

In this Extended lesson you will describe mitosis as nuclear division giving identical cells, state its roles in growth, repair, replacement and asexual reproduction, explain why chromosomes are copied first, and meet stem cells, the unspecialised cells that divide to produce all the specialised cells of the body.

Ebumnobi

[Supplement] Describe mitosis as nuclear division giving rise to genetically identical cells (details of the stages of mitosis are not required)
[Supplement] State the role of mitosis in growth, repair of damaged tissues, replacement of cells and asexual reproduction
[Supplement] State that the exact replication of chromosomes occurs before mitosis
[Supplement] State that during mitosis, the copies of chromosomes separate, maintaining the chromosome number in each daughter cell
[Supplement] Describe stem cells as unspecialised cells that divide by mitosis to produce daughter cells that can become specialised for specific functions

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Cell Division. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Mitosis produces daughter cells that are: A. genetically identical to the parent cell B. haploid C. genetically different from each other D. gametes Answer: A
Which is NOT a role of mitosis? A. growth B. repair of tissues C. production of gametes D. asexual reproduction Answer: C
What happens to the chromosomes just before mitosis begins? A. they are halved B. they are exactly replicated C. they break down D. they pair up and swap genes Answer: B
A cell with 46 chromosomes divides by mitosis. Each daughter cell has: A. 23 chromosomes B. 46 chromosomes C. 92 chromosomes D. a random number Answer: B
Stem cells are best described as: A. specialised cells that cannot divide B. unspecialised cells that divide by mitosis and can specialise C. gametes D. dead cells Answer: B