meiosis Flashcards

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1
Q

how many pairs of chromosomes are in the human cells

A

23

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2
Q

how many chromosomes do gametes have and how many single chromosomes do human gametes have

A

1 23 single chromosomes

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3
Q

where does meiosis take place

A

reproductive organs

male: testes

female:ovaries

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4
Q

what are the stages of meiosis

A
  1. all chromosomes are copied
  2. the cell now divides into 2
  3. now both cells divide 1 more time forming gametes

4.In the gametes, the chromosomes are now single not paired

  1. Meiosis produces four gametes from one original cell. (Each of these four gametes are genetically different from each other and has different alleles)
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5
Q

what does meiosis do to the original cells to the gametes

A

halves the number of chromosomes

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6
Q

what happens to the gametes during the fertilization

A
  1. when gametes join together
  2. after fertilization the cell now has the normal number of chromosomes
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7
Q

what does fertilisation do to the chromosomes

A

restores the full number of chromosomes

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8
Q

What happens after fertilization?

A

Now the new cell divides by mitosis, producing a clump of identical cells.

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9
Q

what happens when the embryo develops

A

the cells differentiate forming different cell types

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10
Q

what type of cells are formed when the embryo is developing

A

nerve cells and muscle cells

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