EP HUMAN BIOLOGY-MODIFIED MASTERING
8th Edition
ISBN: 9780134326436
Author: Johnson
Publisher: PEARSON CO
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Textbook Question
Chapter 21, Problem 2TY
Which of the following will result in fraternal twins?
a. fertilization of one egg by two different sperm
b. division of a fertilized egg into two masses after differentiation has begun
c. fertilization of two eggs by two different sperm
d. division of a fertilized egg into two masses before differentiation has begun
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Chapter 21 Solutions
EP HUMAN BIOLOGY-MODIFIED MASTERING
Ch. 21 - Prob. 1QCCh. 21 - Prob. 2QCCh. 21 -
1. Why does only one sperm fertilize the egg, and...Ch. 21 - Prob. 2CRCh. 21 - Prob. 3CRCh. 21 - Describe the stages of labor and delivery.Ch. 21 - What causes the newborn to take its first breath...Ch. 21 - Prob. 6CRCh. 21 - What causes the onset of puberty (sexual...Ch. 21 - Summarize the three main hypotheses of the causes...
Ch. 21 - Prob. 9CRCh. 21 - Prob. 10CRCh. 21 - Which of the following lists the correct order of...Ch. 21 - Which of the following will result in fraternal...Ch. 21 -
3. Which of the following processes is the first...Ch. 21 - Prob. 4TYCh. 21 - Prob. 5TYCh. 21 - Prob. 6TYCh. 21 -
7. Which of the following is mismatched?
a....Ch. 21 - Prob. 8TYCh. 21 - Prob. 9TYCh. 21 -
10. Which of the following would be detrimental...Ch. 21 - Prob. 11TYCh. 21 - Prob. 12TYCh. 21 - Prob. 13TYCh. 21 - Prob. 14TYCh. 21 - Which hormone plays a critical role both in...Ch. 21 - Prob. 1AWKCh. 21 - Prob. 2AWKCh. 21 - Prob. 3AWKCh. 21 - Each year, it is estimated that over 40,000...Ch. 21 - Prob. 5AWKCh. 21 - Prob. 6AWKCh. 21 - How is it possible that one's life could be...
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- Which of the following rows correctly describes the process and the location of cleavage following fertilization, respectively? Select one: a. Type of Division Location Meiotic Uterus b. Type of Division Location Meiotic Fallopian tube c. Type of Division Location Mitotic Fallopian tube d. Type of Division Location Mitotic Uterusarrow_forwardWhich of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veinsarrow_forwardWhich of the following does NOT happen in the germinal period? a. dividing mass of cells travels to the uterus b. developing organs can be affected by toxins passing through the placenta c. mass of cells form a hollow ball d. cells begin to differentiate.arrow_forward
- Which is/are true concerning chromosomal sex determination? a. Anyone born with two x chromosomes is a male b. Sperm always contain Y chromosomes c. Testis Determining Factor is produced by the SRY allele present on the Y chromosome d. Under normal circumstances, a human embryo that has both and X and a Y chromosome is male.arrow_forwardDuring the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum? Select one: a. The corpus luteum produces relaxin, which thickens the endometrium. b. The corpus luteum ensures that the endometrium does not break down during the first trimester. c. The corpus luteum supports the formation of the placenta. d. The chorion forms the fetal part of the placenta, and the corpus luteum supports the maternal part of the placenta.arrow_forwardOogenesis involves germ cells in the ovary undergoing meiosis to produce a functional ovum at the end of the process.Which of the following cells is penetrated by a sperm cell during the process of fertilization? Select one: a. Secondary oocyte b. Oogonia c. Primary oocyte d. Ovumarrow_forward
- The formation of three germ layers is called Select one: a. gastrulation b. pluripotency c. differentiation d. neurulationarrow_forwardWhich of the following does NOT aid the sperm in fertilization? a. increased mitochondria b. flageullum development c. cytoplasmic bridge d. hyaluronidase and protease e. acrosomesarrow_forwardWhich 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.arrow_forward
- Which of the following rows identifies the site of fertilization and the area in which a fertilized egg implants, respectively? Select one: a. Site of Fertilization Site of Implantation Fallopian tube Endometrium b. Site of Fertilization Site of Implantation Uterus Placenta c. Site of Fertilization Site of Implantation Uterus Endometrium d. Site of Fertilization Site of Implantation Fallopian tube Placentaarrow_forwarda. If a couple had more than one child, would all the children have the same bands as the first one? b. Which event in meiosis might explain your answer?arrow_forwardWhich of the following is a major difference between spermatogenesis and oogenesis? a. Spermatogenesis involves meiosis, and oogenesis involves mitosis. b. Spermatogenesis is continuous, but oogenesis is variable. c. Spermatogenesis produces fewer gametes per precursor cell than oogenesis. d. All of these are significant differences between oogenesis and spermatogenesis.arrow_forward
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