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32 Cards in this Set
- Front
- Back
What are characteristics of Meiosis?
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1-Similar to Mitosis
2-Involves the production of daughter cells that have 1/2 the number and kinds of chromosomes as the parent cell |
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Where does meiosis occur?
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Only in those cells that produce gametes.
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Explain the process of Meiosis.
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It is a "double trip" through mitosis, but the second time around interphase is skipped allowing the chromosomes not to be duplicated.
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In males what is the process of the formation of spermatozoa called?
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Spermatogenesis
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In females the process of the formation of ova is called what?
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Oogenesis
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What cells are found in the seminiferous tubules of the testes?
And what do they mitotically divide to form? |
1-Spermatogonia
2-Primary Spermacytes |
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In females what do the ovaries contain?
And what do they mitotically divide to form? |
1-Oogonia
2-Primary Oocytes |
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What do the primary spermacytes in males meiotically divide to form?
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Spermatazoa
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What are the only cells that undergo meiosis in a male called?
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Primary Spermatocytes
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What do primary oocytes form?
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Ova
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In females what are the only cells that undergo meiotic division?
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Primary Oocytes
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What is the pairing of homologous chromosomes that ocurs prior to their replication?
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Synapsis
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What constitutes a pair of chromosomes, one member of each pair arising from reach parent?
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Homologous Chromosomes
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Homologous chromosomes have genes that deal with the same ____ but perhaps different ____.
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1-Trait
2-Characteristics |
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IN humans there are _____ chromosomes and about _______ genes.
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46
30,000 |
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What does the term HAPLOID mean?
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The half set of chromosomes (like that found in the gametes)
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In humans what is the haploid number and how is it abbreviated?
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23
1N |
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What does the term DIPLOID suggest?
What is its abbreviation? |
The cells contain the full set of chromosomes.
2N |
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What cells are Diploid Cells?
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Somatic cells
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What is a tetrad?
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A duplicated pair of chromosomes.
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What are the three regions of a typical spermatozoon?
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1-Head
2-Middle Piece 3-Tail |
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What does the head contain?
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1-The Acrosome
2-The haploid Nucleus |
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What does the acrosome release?
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The enzyme hyaluronidase
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What does hyaluronidase act upon and what does this facilitate?
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hyaluronic acid
the fertilization process |
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What does the middle piece contain?
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1-The mitochondrial spiral (provides energy)
2-The axial filament (provides support) |
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What structure does the tail include?
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The flagella-like tail used for motility.
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What are the three various types of yolk distribution that ova are described according to?
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1- Isolecithal
2- Telolecithal 3- Centrolecithal |
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What is an isolecithal yolk distribution?
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An even yolk distribution throughout the egg.
(Humans and most other mammals) |
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What is a telocithal yolk distribution?
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The yolk is distributed at one end of the cell.
(Reptiles, birds, and amphibians) |
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What is a discoidal yolk distribution?
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Another term for a telocithal yolk distrubution.
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What is a centroloithal yolk distribution?
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Yolk distributed in the center of the egg.
(Arthropods and insects) |
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What are the amount of yolk in an egg and the distribution of that yolk major detriminants of?
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The course of embryonic development.
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