Term
| Meiosis is a form of cell division that results in the production of ____ |
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Definition
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Term
- gametes
- contain ___ the number of chromosomes of an adult body
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Definition
- egg cells and sperm cells
- half
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Term
Diploid vs. Haploid:
Somatic are __
gametes are __
diploid have __ set(s) of chromosomes
haploid have __ set(s) of chromosomes. |
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Definition
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Term
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Definition
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Term
| sexual reproduction includes the fusion of gametes to produce a ___ ___ |
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Definition
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Term
| Life cycles of sexually reproducing organisms involve the alternation of ___ and __ stages. |
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Definition
| diploid and haploid stages |
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Term
| meiosis includes __ rounds of division known as... |
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Definition
| 2, meiosis I and meiosis II |
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Term
During meiosis I, homologous chromosomes (homologues) become closely associated with each other. This is _____
proteins between the homologues hold them in a _____ ____ |
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Definition
synapsis
synaptonemal complex |
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Term
- crossing over:
- physically, it's the ...
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Definition
- genetic recombination of sister chromatids
- exchange of regions of the chromatids
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Term
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Definition
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Term
| the homologues are sparated from each other in ___ _ |
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Definition
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Term
True/false
Meiosis involves two successive cell divisions with NO replication b/t them |
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Definition
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Term
Prophase I:
- ____ coils tighter
- nuclear envelope ____
- homologues become closely associated in ___
- ___ ___ occurs between NON-sister chromatids
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Definition
- chromosomes
- dissolves
- synapsis
- crossing over
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Term
Metaphase I:
- ____ ____ hold homologues together following crossing over
- microtubules from opposite poles attach to each ____, not the ____ ____
- homologues are aligned at the ___ ___ side-by-side
- the orientation of each pair of homologues on the spindle is ____
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Definition
- terminal chiasma
- homologue not sister chromatids
- metaphase plate
- random
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Term
Anaphase I:
- _____ of the spindle shorten
- _____ are separated from each other
- ___ ___ remain attached to each other
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Definition
- microtubules
- homologues
- sister chromatids (attached at centromeres)
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Term
Telophase I:
- ___ ___ form around each set of chromosomes
- each new nucleus is now ___
- sister chromatids are no longer ___ because of crossing over
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Definition
- nuclear envelopes
- haploid
- no longer identical
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Term
meiosis II resembles a ___ division:
- prophase II: __ __ disolves & __ __ forms
- metaphase II: chromosomes align on __ __
- anaphase II: __ __ are separated
- telophase II: __ __ re-forms; __ follows
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Definition
mitotic
- nuclear envelopes, spindle apparatus
- metaphase plate
- sister chromatids
- nuclear envelope, cytokinesis
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Term
| What 4 features characterize meiosis? |
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Definition
- synapsis/crossing over
- sister chromatids remain joined through meiosis I
- kinetochores of sister chomatids remain attached throu meiosis I
- DNA replication is surpressed b/t meiosis I and meiosis II
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Term
True/False:
Meiosis produces HAPLOID cells that are NOT identical to each other. |
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Definition
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Term
Genetic Differences arise from...
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Definition
crossing over
independent assortment |
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