The Cell Lecture 16

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  • Created by: saraht83
  • Created on: 01-05-16 21:02
Meiosis
independent assortment of chromosomes explains Mendel's ratio
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Interphase
chromosomes are unpaired
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Prophase
chromosomes and centromeres have replicated, homologs synpase
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Anaphase
centromeres attach to spindle and are pulled to poles of cell
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Telophase
two cells form
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Second anaphase
new spindles form, centromeres divide
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End of meiosis
four cells are produced
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Recombination
homologous chromosomes line up to form a tetrad, adjacent chromatids of different homologs break and rejoin, a chiasma forms and is resolved.
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Recombinant chromatids
contain genetic material from different homologs
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Lynne Margulis
proposed the mitochondria arose from symbiosis between two cells, one engulfing the other, engulfed cell became mitochondrion
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Variegated leaves
all-white branch, all green branch, main shoot mixed
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Second generation
mutations in somatic cells do not affect germ line
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Third generation
mutations in germ cell affects germ line
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Viable trisomies
Down's (trisomy 21), Klinfelter (XXY), XYY, XXX
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Viable monosomy
Turner's (XO)
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Evolutionary advantages to sex
brings together advantageous alleles, deleterious alleles (masked by paired chromosomes), recombination as DNA repair
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Other cards in this set

Card 2

Front

chromosomes are unpaired

Back

Interphase

Card 3

Front

chromosomes and centromeres have replicated, homologs synpase

Back

Preview of the back of card 3

Card 4

Front

centromeres attach to spindle and are pulled to poles of cell

Back

Preview of the back of card 4

Card 5

Front

two cells form

Back

Preview of the back of card 5
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