meiosis- lqc 3 Flashcards
how many chromosomes do human cells have
46, 23 pairs
haploid
Half the number of chromosomes as a somatic cell / body cell /cell other than a gamete
diploid
Full number of chromosomes in a found in a somatic cell/body cell/ cell other than a gamete. Two copies of each chromosome
What are the two important roles of meiosis?
- Creates haploid cells, to maintain the diploid number of chromosomes after fertilisation
- Creates genetic variation in gametes and therefore offspring
Is meiosis cell division or nuclear (nucleus) division?
nuclear division
how many divisions are there in meiosis
two
What separates during the first division of meiosis (meiosis I)?
homologous chromosomes
What separates during the second division of meiosis (meiosis II)?
sister chromatids
How many daughter cells (gametes) are produced from one parent cell?
4
Are the daughter cells (gametes) produced haploid or diploid?
haploid
Are the daughter cells produced (gametes) genetically identical to each other?
no
Where does meiosis take place in a human male?
testes
Where does meiosis take place in human female?
ovaries
the process of meiosis
homologous chromosomes line up in pairs, meiosis I- homologous chromosomes separate from each other as the spindle fibres contract, meiosis II- sister chromatids separate from each other producing 4 gametes
What is independent assortment of chromosomes?
Random aligning of maternal and paternal chromosomes along the equator of the cell
Producing new combinations of chromosomes/alleles
