Card Set Information
BIO 100 exam
exam 2 meiosis from nuclear division powerpoint
special type of nuclear division that produces 4 nuclei/cells with a haploid number of chromosomes
reduces the number of chromosomes to ?
half the number present in the parental nucleus
what does meiosis ensure?
that each new cell/nucleus receives one chromosome of each type
similar but not identical
_____ organisms are composed of cells with two chromosomes of each type
what kind of information is packaged into chromosomes?
genes have a physical address, t or f?
one member of each homologous pair came from?
one parent and other came from the other parent
humans have how many chromosomes? pairs?
have half the number of chromosomes,but also have one chromosome of each type
how many steps is meiosis?
2 step process
what kind of chromosomes must pair?
what happens during prophase I?
homologous chromosomes pair up
chromosomes move toward opposite poles of cell, but centromeres do not divide
telophase I and cytokinesis?
nuclear envelope reforms
take spindle apart
What happens after telophase I?
left with 2 nuclei with 1 chromosome of each type
difference between meiosis I and II?
centromeres divide in meiosis II during anaphase
after meiosis II what do you end up with?
4 cells in 4 nuclear envelopes
have reduced number by half and have 1 chromosome of each type
meiosis has 1 function?
the production of gammetes (sperm cells and egg cells)
division of nucleus is not the same as ?
division of cytoplasm
after sperm and egg go together what occurs?
only ____ meiotic product(s) surrives?
during metaphase I when chromosomes line up, all permutations turn out to be equally probable
what happens during prophase I that happens to all 23 chromosomes in humans?
they pair up, chromatids exchange and create unique genetic combinations
meiosis only happens in? while mitosis can happen ?
ovaries and testes