Bio 113 Animal Reproduction & Embryology

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24 Terms

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gonads

organs that produce gametes

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testes

male gonads produce sperm in semineferous tubules

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epididymis

coiled duct where sperm passes into from semineferous tubules

takes about 3 weeks

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vas deferens

muscular duct where sperm is passed through

extends around & behind urinary bladder where it joins seminal vesicle, making ejaculatory duct

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ovaries

pair that flanks uterus & held by ligaments

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oviduct

fallopian tube

extends uterus towards opening at each ovary

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uterus

womb

thick/muscular organ

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endometrium

inner lining of uterus supplied with blood vessels

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cervix

neck of uterus

opens into vagina

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equal cytokinesis

process where a parent cell divides its cytoplasm & organelles into 2 roughly equal daughter cells

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unequal cytokinesis

1 daughter cell receives a disproportionately larger amount of cellular contents

usually seen in human oogenesis

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deuterosomes

embryos that make the anus first

in humans

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stages of development

fertilization

cleavage

gastrulation

organogenesis

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fertilization

union of sperm & egg

cortical reaction

preventing polyspermy (fertilized by only 1 sperm)

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cleavage

series of rapid cell divisions during early development

make blastulas

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blastulas

hollow ball of cells

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blastoceal

primitive body cavity in blastullas

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gastrulation

reorganization & cell migration to form germ layers (ectoderm, mesoderm, endoderm)

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organogenesis

formation of organs

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neurulation

making of nervous system

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metamorphosis

some insects

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ectoderm

becomes spiny skin/nervous tissue

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mesoderm

becomes connective/muscle tissue

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endoderm

becomes digestive system