Answers to control of mammalian oestrous 1. (a) nigh twenty-four hour point in snip 2 / sidereal mean solar twenty-four hour period 20; Coincides with LH / follicle-stimulating endocrine peak;2 (b) (No) / (no mark for no) progesterone levels fail;1 [3] 2. (a) follicle-stimulating hormone stimulates rebelth of a follicle; Developing follicle produces estrogen; (follicle-stimulating hormone) and LH bring about ovulation / passion; LH stimulates constitution of dealer luteum; LH stimulates production of progesterone; Fall in LH / follicle-stimulating hormone means estrogen production no yearlong stimulated;5 max (b) (i) progesterone inhibits FSH; No follicles stand up; (ii) Causes rise in FSH / inhibition of FSH withdraw; Stimulates follicle development;4 [9] 3. (a) (i) LH peaks/is laid-back (on day 12):1 (ii) spermatozoon stimulate blend in up to 2-7 geezerhood; junkies can survive few hours/ up to 3 days; OR general idea of short-lived gametes (e.g. a few days) = max.
1 mark2 (b) (i)1nhibits (release of) FSH; Follicle does not develop/ ripe(p)/grow/prevent ovulation/ FSH causes follicles to develop; (Allow: ovum not produced) [Reject: indication to follicle production]2 (ii)Progesterone;1 [6] 4. (a)Any 2 from: Follicle diameter/ surface drops short on day 21/at this snip; Egg/ovum/oocyte released from follicle (causes size decrease); principal sum luteum formed on day 21/at this time;max 2 [Note: upper hold 1 mark if no time given] (b)On day 18 oestrogen peaks/at 6.0/rises to highest apprize; = 1 day in the lead start of oestrus; 2 (c)Size and density state a plus correlation/described; dealer luteum produces progesterone; 2 (d)Any six from: 1...If you trust to get a secure essay, order it on our website:
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