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identify and describe the stages of meiosis 1 division?
- 1. Early prophase 1
- 2. middle prophase 1
- 3. metaphase 1
- 4. anaphase 1
- 5. telophase 1
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identify and describe the stages of meiosis 2?
- 1. Prophase 2
- 2. Metaphase 2
- 3. Anaphase 2
- 4. Telophase 2
- 5. Haploid cells 2
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Describe the differences between spermatogenesis and oogenesis:
- Spermatogenesis: happens in the males testes, they produce spermatozoa, it is continuous from puberty to death.
- Oogenesis: takes place in females' ovaries, it has ovum which is spherical, not motile and is much larger with more food reserves and cytoplasm, oogenesis occurs in the fetus.
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Identify the primary germ layers and their end tissues:
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Describe Endoderm layer.
the inner germ layer forms the linings of various tracts.
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Describe ectoderm layer
The outer germ layer, which forms many of the structures around the periphery of the body.
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Describe Mesoderm layer
The middle germ layer that forms most of the organs other structures between those formed by the endoderm and ectoderm.
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Describe early prophase I
The duplicated chromosomes become visible.
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descrube middle prophase I
Homologous chromosomes synapse to form tetrads.
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Metaphase I
Tetrads align at the equatorial plane.
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Anaphase I
Homologous chromosomes move apart to opposite sides of the cell.
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Describe Telophase I
New nuclei form, and the cell divides; dring interkinesis there is no duplication of chromosomes.
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Describe Prophase II
Each chromosome consists of two chromatids.
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Describe Metaphase II
Chromosomes align at the equatorial plane.
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Describe anaphase II
Chromatids separate and each is now called a chromosome.
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Describe Telophase II
New nuclei form around the chromosomes.
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Describe haploid cells
The chromosomes are about to unravel and become less distinct chromatin.
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Where is the most blood supply in the uterus
Myometrium
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