Flashcards
unit 2.3
Flashcards do conjunto (19)
- 1what is meiosis?meiosis is the process of cell division that produces the gametes- sperm and eggs
- 2what are the gametes?The gametes are the sex cells. They are the:
1)eggs produced in the ovaries of the female reproductive system
2)sperm produced in the testes of the male reproductive system - 3how many chromosomes do the gametes have?the gametes have 23 chromosomes which are known as the haploid number or n
- 4are the female and male sex chromosomes homologous pairs?the female sex chromosomes are homologous pairs but the male ones aren't
- 5how many stages of meiosis are there?there are 6 stages of meiosis
- 6what are the 6 stages?1) metaphase I
2) anaphase I
3) telophase I
4) metaphase II
5) anaphase II
6) telophase II
- 7what happens in the first stage of metaphase?replicated chromosomes from homologous pairs attach to spindle fibres and line up in the middle
- 8what happens in the first stage of anaphase?one replicated chromosome of each plate moves to each pole
- 9what happens in the first stage of telophase?two cells are forme each with one replicated chromosome
- 10what happens in the second stage of metaphase?chromosomes line up on the equator attached to spindle fibres
- 11what happens in the second stage of anaphase?chromatids separate and move to poles
- 12what happens in the second stage of telophase?four cells result with one copy of each chromosome. These are known as haploid gametes
- 13what is sexual reproduction?it is the role of the male and female reproductive systems to ensure that:
1) the male and female gametes meet
2) fertilisation takes place
3) the new individual has the best chance of surviving - 14in what part of the flower does meiosis produce haploid pollen?the anther
- 15in what part of the flower does meiosis produce haploid ovules?the ovary
- 16in females where does meiosis take place and what does it produce?it takes place in the ovaries producing haploid eggs
- 17in males where does meiosis take place and what does it produce?it takes place in the testes producing haploid sperm
- 18when does fertilisation occur?when a single egg and a single sperm fuse in an animal, or when an ovule and pollen cell fuse in a plant.
- 19what happens when fertilisation occurs?new offspring's are created
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- FlashCards sobre unit 2.3, criado por makargbe dukuly em 14-02-2017.
- Criado por
- makargbe dukuly
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