Which of the following scenarios does NOT describe an event that leads to the conceptions of twins? Select one: A. two eggs are fertilized by two sperm cells, resulting in a fraternal twin. B. High levels of FSH stimulate the maturation of three ovums. C. Two eggs are fertilized by one sperm cell, resulting in a monozygotic twin. D. One egg is fertilized by one sperm but divides into two zygotes, resulting in two babies of the same gender.

Which of the following scenarios does NOT describe an event that leads to the conceptions of twins? Select one: A. two eggs are fertilized by two sperm cells, resulting in a fraternal twin. B. High levels of FSH stimulate the maturation of three ovums. C. Two eggs are fertilized by one sperm cell, resulting in a monozygotic twin. D. One egg is fertilized by one sperm but divides into two zygotes, resulting in two babies of the same gender.

An Illustrated Guide To Vet Med Term

4th Edition

ISBN:9781305465763

Author:ROMICH

Publisher:ROMICH

Chapter12: 1+1=3 (or More)

Section: Chapter Questions

Problem 8CTE

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Which of the following scenarios does NOT describe an event that leads to the conception of twins? Select one: a. Two eggs are fertilized by two sperm cells, resulting in fraternal twins. b. Two eggs are fertilized by one sperm cell, resulting in monozygotic twins. c. High levels of FSH stimulates maturation of three ovums. d. One egg is fertilized by one sperm but divides into two zygotes, resulting in two babies of the same gender.
Which of the following statements does NOT correctly describe the events following fertilization? Select one: a. Only the inner cell mass cells in a blastocyst are pluripotent. b. The trophoblast has an important role in maintaining the pregnancy, as it prevents the endometrium from shedding. c. As hCG takes over maintaining the endometrium immediately after implantation, the corpus luteum degenerates into the corpus albican. d. All 16 cells in a morula are truly totipotent, meaning that they can become any cells in the human body.
The change of successful fertilization is approximately 18% in every cycle. Why does this statistic seem so low? All of the following statements provide a reason as to why the chance of fertilization is 18% every ovarian cycle EXEPT Select one: A. Some Sperm cells are not very motile, while others are formed without a tail. B. If more than one sperm fertilizes an egg, multiple embryos can result. C. Vagina is very acidic, killing many sperm. D. There two fallopian tubes and two ovaries, but only one of them releases an ovum every cycle.
In humans:a. How many sperm develop from 100 primaryspermatocytes?b. How many sperm develop from 100 secondaryspermatocytes?c. How many sperm develop from 100 spermatids?d. How many ova develop from 100 primary oocytes?e. How many ova develop from 100 secondaryoocytes?f. How many ova develop from 100 polar bodies?
Which of the following statements regarding the formation of human twins is INCORRECT? a. Nearly all identical twins form before the 9th day following fertilization. b. Identical twins share an umbilical cord. c. Fraternal twins form after two eggs become fertilized. d. Identical twins form after two eggs become fertilized.
The chance of successful fertilization is approximately 18% in every cycle. Why does this statistic seem so low? All of the following statements provide a reason as to why the chance of fertilization is only 18% for every ovarian cycle EXCEPT Select one: a. Some sperm cells are not very motile, while others are formed without a tail. b. There are two Fallopian tubes and two ovaries, but only one of them releases an ovum every cycle. c. If more than one sperm fertilize an egg, multiple embryos can result. d. The vagina is very acidic, killing many sperm cells.
An individual has the chromosomal makeup XX and sexual differentiation proceeds normally. Which of the following would be the case? a. Mullerian ducts will degenerate b. Estrogen promotes development of the vagina c. Anti-Mullerian hormone is present d. Wolffian ducts will develop e. There will be no formation of fetal testes
Which of the following stages of the fertilization process stimulates completion of meiosis II in the oocyte’s nucleus? A. The sperm nucleus and egg nucleus combine to form the genetic material of the zygote B. Sperm release enzymes to digest the protein layer of the secondary oocyte C. The entry of a sperm into the secondary oocyte D. The swimming of sperm from the vagina, through the uterus, and up to an oviduct
Which of the following represents the fertilization process for monozygotic twins? a. One egg is fertilized by two different sperm. b. One egg splits and is then fertilized by two different sperm. c. One egg is fertilized by one sperm and then splits. d. Two eggs are fertilized by the same sperm.
Which of the following statements does NOT correctly describe the similarities and differences between male and female reproductive systems? Select one: a. Millions of mature sperm are produced on a daily basis, whereas single mature ovum is released every 28 days. b. Meiosis is completed in eggs after fertilization begins, whereas a mature sperm has completed meiosis prior to fertilization. c. Eggs and sperm contain exactly half of the genetic material of a normal somatic cell. Many zygotes with an abnormal number of genetic material often do not successfully implant. d. Eggs and sperm can survive for 3 to 5 days in the Fallopian tubes.
What is the difference between in vitro fertilization (IVF)and artificial insemination? Select one: a. IVF involves fertilization outside the body, whereas artificial insemination involves internal fertilization. b. During IVF, gametes are introduced into the womb, whereas during artificial insemination, a blastocyst is implanted on the uterus. c. IVF includes giving the woman additional FSH and LH to induce superovulation, whereas artificial insemination involves a woman undergoing any hormonal treatment. d. Artificial insemination can be used during a surrogacy, whereas IVF cannot.
conjoined twins occur when the cleavage occurs at : a. tow-cell stage b. morula stage c. blastocyst stage d. embryonic disc stage