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- How does the oocyte prevent polyspermy? a) Changing the structure of the zona pellucida when a sperm fuses with the oocyte cell membrane b) Releasing enzymes, which destroy all other sperm c) Moving away from any surrounding sperm d) Shedding the zona pellucidaWhy is a second polar body expelled after fertilisation? a) To remove excess cytoplasm b) Because the oocyte must reactivate the incomplete meiosis before fusing with the sperm c) Before fusion with the sperm it must complete mitosis d) The fertilised oocyte is not a haploid cell until it expels the sperms mitochondriaWhat would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? a. The cells would not continue to divide. b. The corpus luteum would continue to produce progesterone and estrogen. c. Menses would flush the blastocyst out of the uterus. d. The uterine mucosa would not envelop the blastocyst.
- a) How are oocytes released? b) How are spermatozoa released? c) What is the frequency of both? d) How many of each are produced during meiosis?What immediate effect does the SRY gene have on a developing fetus? A) It directs the gonads to develop into testes. B) It directs the gonads to develop into ovaries. C) It directs the Müllerian ducts to develop into female internal reproductive structures.Why does continued breastfeeding decrease the chance of pregnancy? (Hint: Think about the effect the breastfeeding hormones have on estrogens and progesterone.)?
- What happened if there is an excessive secretion of prostaglandin during menstruation? a,Inflammation b,Unfertilized egg is lost c,Irregular menstrual cycle d.CrampsHow does the production of sperm differ from the production of eggs? a. Sperm production involves meiosis, whereas egg production involves only mitosis. b. Meiosis during sperm production produces four sperm cells, whereas meiosis during egg production produces only one functional egg cell. c. Sperm are haploid, whereas eggs are diploid. d. Sperm production begins during fetal development, whereas the meiotic process that begins egg production doesn’t begin until pubertyWhich cell contributes the necessary nutrition to the growing zygote? a a polar body b the egg cell c a spermatocyte d the sperm cell
- The process by which the structure labeled B is released from the structure labeled A is known as? A. differentiation B. ovulation C. gastrulation D. germinationThe process forming the neural tube and plate via the intercalation of cells along the medial-lateral axis and extension along the anterior-posterior axis occurs is called? a. neurulation b. embryogenesis c. convergent extension d. morphogenesisHow does amount of yolk affect cleavage? Compare cleavage in a sea star with that in a bird
