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Related Flashcards
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 |
