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27 Cards in this Set
- Front
- Back
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without meiosis, ____ ____ can't happen
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sexual reproduction
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meiosis I results in the ____
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reduction of the number of chromosomes
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prophase I -
1. ____ forms 2. ____ happens between the chromatids |
tetrads
crossing-over |
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tetrad has how many chromatids?
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4
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crossing-over
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process when genes on the chromatids in a tetrad are exchanged
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metaphase I -
1. the tetrads as a ____ are located at the ____ |
unit, equator
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anahase I -
1. each ____ is pulled away from its ____ toward ____ ____ 2. the ____ remain attached 3. the cluster of ____ around each pole is ____ (there's ____ as many chromosomes as in the original cell, but each chromosome is ____-stranded) |
chromosomes, homologous partner, opposite poles
sister chromatids chromosomes, haploid, half, double |
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telophase I -
1. chromosomes are ____-____ 2. in some organisms the ____ ____ reappears around each new nuclear area: in others it does not |
double-stranded
nuclear envelope |
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interphase:
1. no ____ ____ occurs |
DNA replication
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meiosis II -
this second stages ____ the ____, ending in #____ (type)____ cells called ____ |
separates, chromatids
4 haploid, gametes |
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gametes are ____ cells
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reproductive
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meiosis occurs in any living things that ____ ____
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reproduces sexually
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meiosis occurs because of ____ ____
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sexual reproduction
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sperm(N) + egg(N) = ____ ____ (____)(2N)
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fertilized egg
zygote |
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zygote
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fertilized egg
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2N --> N
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meisosis I
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what does meiosis I result in?
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the reduction of the number of chromosomes
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what does meisosis II result in?
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the separation of chromatids that ends in 4 haploid cells called gametes
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genes
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sections of chromatids that control different things
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crossing-over results in...
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genetic variations
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humans have how many homelogous pairs?
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23
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what does prophase I result in?
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a tetrad and crossing-over
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what does metaphase I result in?
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tetrads located at the equator
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what does Anaphase I result in?
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cluster of chromosomes that are haploid at each pole
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what does telophase I result in?
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reappearance of nuclear envelope in some organisms
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double-stranded
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2 sister chromatids
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when does DNA replication occur?
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before meiosis
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