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eferences Mailings Review View Help BbCr AaBbcct AaB AaBbcet |:1 . | 2.E-LermaNo Spac-Heading 1 Heading 2 Title Subtitle _a. Paragraph Styles 26. Fertilization allows the contents from egg and sperm to recombine, but most of the contents in the fertilized egg cells are donated by the oocyte except A centriole and half of the genetic material B: mitochondria and Golgi complex C: Microtubules and actin filaments D Cell membrane and mRNA 27. Translocation of gamete cells to oviduct during fertilization in mammals is completed by combined factors. Which of the following factors plays the most critical role in gamete translocation? A: Gamete mobility B: Large-scale physical propulsion (by uterine muscle contractions) C: Chemical attraction (chemotaxis) D: Sperm theotaxis 28. TF Sperm capacitation is the process that newly ejaculated mammalian sperm reside for some time in the female reproductive tract and undergo a set of physiological changes to become competent to fertilize the egg. 0VExplanation / Answer
26. Option A is the correct answer. The half of the genetic material in a zygote comes from sperm and another half of the genetic material comes from the oocytes. In some species, sperms also contribute to centriole which helps make up the zygotic centrosome required for the first division.
27. Option D is correct. Coitus induces fluid flow from oviduct to uterus, and sperm align themselves against the flow direction and swim upstream, This phenomenon is termed as sperm rheotaxis. This sperm rheotaxis play a major role in sperm translocation.
28. The statement is true. Before penetrating the oocyte membrane, the sperm cells go through several essential physiological changes during their time in the female genital tract.
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