7674018
Beschreibung
Karteikarten von makargbe dukuly, aktualisiert more than 1 year ago
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Erstellt von makargbe dukuly
vor mehr als 7 Jahre
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| Frage | Antworten |
| what is meiosis? | meiosis is the process of cell division that produces the gametes- sperm and eggs |
| what 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 |
| how many chromosomes do the gametes have? | the gametes have 23 chromosomes which are known as the haploid number or n |
| are the female and male sex chromosomes homologous pairs? | the female sex chromosomes are homologous pairs but the male ones aren't |
| how many stages of meiosis are there? | there are 6 stages of meiosis |
| what are the 6 stages? | 1) metaphase I 2) anaphase I 3) telophase I 4) metaphase II 5) anaphase II 6) telophase II |
| what happens in the first stage of metaphase? | replicated chromosomes from homologous pairs attach to spindle fibres and line up in the middle |
| what happens in the first stage of anaphase? | one replicated chromosome of each plate moves to each pole |
| what happens in the first stage of telophase? | two cells are forme each with one replicated chromosome |
| what happens in the second stage of metaphase? | chromosomes line up on the equator attached to spindle fibres |
| what happens in the second stage of anaphase? | chromatids separate and move to poles |
| what happens in the second stage of telophase? | four cells result with one copy of each chromosome. These are known as haploid gametes |
| what 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 |
| in what part of the flower does meiosis produce haploid pollen? | the anther |
| in what part of the flower does meiosis produce haploid ovules? | the ovary |
| in females where does meiosis take place and what does it produce? | it takes place in the ovaries producing haploid eggs |
| in males where does meiosis take place and what does it produce? | it takes place in the testes producing haploid sperm |
| when 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. |
| what happens when fertilisation occurs? | new offspring's are created |
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