Biology - 0610 CIE

Meiosis

Gbogbo ọrọ náà

If gametes had the full set of chromosomes, every fertilisation would double the number, and life would quickly become impossible. Meiosis solves this: it is the special cell division that halves the chromosome number to make gametes, and along the way it shuffles the genetic deck so that no two gametes are quite the same.

In this short Extended lesson you will state that meiosis makes gametes and define it as a reduction division that halves the chromosome number from diploid to haploid, producing genetically different cells.

Ebumnobi

[Supplement] State that meiosis is involved in the production of gametes
[Supplement] Describe meiosis as a reduction division in which the chromosome number is halved from diploid to haploid resulting in genetically different cells (details of the stages of meiosis are not required)

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Meiosis. 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.

Meiosis is involved in the production of: A. body cells B. gametes C. identical clones D. stem cells Answer: B
In meiosis the chromosome number is: A. doubled B. maintained C. halved from diploid to haploid D. unchanged Answer: C
The cells produced by meiosis are: A. genetically identical B. genetically different C. always diploid D. body cells Answer: B
A human cell with 46 chromosomes undergoes meiosis. Each gamete has: A. 46 chromosomes B. 92 chromosomes C. 23 chromosomes D. 12 chromosomes Answer: C
Which process restores the diploid number after meiosis? A. mitosis B. fertilisation C. replication D. germination Answer: B