Lab 7 Meiosis Flashcards
where does meiosis occur in animal cells
gonads
where does meiosis occur in plant cells
sporangia
what are the two nuclear division in meiosis
meiosis I and II
what happens when a cell is neither in meiosis I or II
cells do not grow and synthesis of DNA does not take place
what does meiosis result in
four, non-identical daughter cells with half the number of chromosomes as the original parent cell
haploid cells
- n
- cell with only one of each homologous pair of chromosomes
diploid cells
- 2n
- parent cells
- pairs of homologous chromosomes
what do the haploid cells become
eggs, sperm, or spores
what happens when the homologous chromosome pairs do not separate properly
- final nuclei may have either too many or too few chromosomes
- this can happen if sister chromatids don’t spilt as well
interphase
similar as when in mitosis
- occurs before meiosis
what happens within the first division in meiosis
chromosomes coil and condense
what occurs during the beginning of meiosis I
- nuclear envelope breaks down and spindles form
what happens in early prophase I
Synapsis
-each chromosome finds it homolog and pairs in a tight association
- genetic information begins to be shared
how are the synapsed homologous pairs held together
zipperlike protein called the synaptonemal complex
tetrad
each paired duplicated chromosome complex is made of four strands
