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21 Cards in this Set
- Front
- Back
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describe mitosis
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2 daughter cells
identical diploid - 46 chromosomes somatic (any cell not for reproduction) repair and replace |
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describe meiosis
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4 daughter cells
unique haploid (23 chromosomes) gametes reproduction only |
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what is oogenesis
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process of development of ova (egg) via meiosis
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what is spermatogenesis
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process of development of sperm via meiosis
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how many chromosomes do oocyte and spermozoa have each
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23 - haploid
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what is another name for Down's syndrome
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trisomy 21 -
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describe some distinctive features of infant with Down's syndrome
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hypotonia - increases joint flexibility
small mouth, ears and chin, protruding tongue flat face and occiput, wide-set eyes thick neck, short limbs, palmar simian crease wide gap between toes |
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list some health issues common to trisomy 21
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mild to moderate intellectual disability
delayed motor skills stunted growth increased risk of cardiac, vision, hearing issues increased risk of sleep apnoea and epilepsy |
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where is testosterone produced
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in testes by cells of Lydig
in ovaries in small amounts in adrenal glands |
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what is testosterone responsible for
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masulinisation of reproductive tract
secondary sex characteristics: libido, sex drive, hairy bits, deep voice, inc. muscles, aggression Spermatogenisis |
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what is spermatogenesis for
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continual production of spermatozoa via meiosis
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how long does it take to produce sperm
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73 days from germ cell to mature sperm
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what amount is average ejaculate and how many sperm in it
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3-6 mls
60-200 million sperm |
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describe the makeup of seminal fluid
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contains sperm, prostaglandins, seminal plasmin, clotting factors
relatively alkaline |
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what is capacitation (in regards to reproduction) and what happens
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fertilising capacity of sperm
proteins removed from head of sperm which activates sperm so it can release hyaluronidase |
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what size is an empty uterus
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approx size of a pear
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what is the role of an ovary
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produce ova
produce hormones - oestrogen, progesterone |
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what is oogenesis
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process of ova production
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when are ova formed
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by 6 months in-utero
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describe oocyte numbers at
birth puberty |
birth - 2 million oocytes
puberty - 200,000 |
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how many ova are released during reproductive life
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approx 400
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