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26 Cards in this Set
- Front
- Back
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Describe the cell cycle
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interphase is G
M for nuclear and cellular division G1/S checkpoint S G2/M checkpoint |
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define chromosomes
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pices of DNA with genes and a centromere
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when do homologous chromosomes pair
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prophase I
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when does recombination occur
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metaphase I
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is MI or M2 reduction division
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M1
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when is "synapsis"
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prophase I
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when are tetrads present
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metaphase I
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when are dyads present
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Anaphase I
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when are monads present
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meiosis II
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what is interkinesis
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between anaphase I and metaphase II
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what happens in prophase (in detail)
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homolgous chromosomes pair
synaptonemal complex forms recombination diplotene chiasmata form at site of recombination syn complex dissolves homologous chromosomes are held together by chaismata |
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describe spermatogenesis
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stem cell spermatogonium
daughter cell primary spermatocyte meiosis I secondary spermatocyte meiosis II spermatids spermatozoa four viable products |
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describe oogenesis
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oogonium
mitosis/growth primary oocyte meiosis I first polar body secondary oocyte meiosis II ovum and second polar body |
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where is the primary ooctye arrested at birth
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prophase I
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where is the primary oocyte arrested in childhood
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still prophase I
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where is the secondary oocyte arrested
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metaphase II
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when will meiosis II be completed for a secondary oocyte
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only if sperm penetration occurs
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describe the follicle developmetn in the ovary
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follocile primordial follicle
growing follicle vesicular follicle ovulated secondary oocyte |
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is the embryo sac male or female gametophyte
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female
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is the pollen grain male or female gamotophyte
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male
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what produces megaspores
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megasporangium
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what produce microspores
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microsporangium
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describe what happens from the microsporocyte flower on
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microsporocyte flower is diploid
meiosis mitosis unequal cell division haploid generative nucleus, pollen grain, haploid tube nucleus mitosis pollen tube, two haploid sperm cells, tube nucleus |
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describe what happens from the megaspore on
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pistil/ovary
megasporocyte is diploid meiosis only one survives mitosis into eight nuclei but the cell itself does not divide binucleate cell with embryo sack and egg |
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do microspores lead to sperm or egg
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sperm
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what happens in flower sex
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double fertilization for endosperm triploid 3n and an embryo diploid 2n
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