What is Life? A Guide to Biology with Physiology
3rd Edition
ISBN: 9781464157745
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 25, Problem 3MC
Summary Introduction
Introduction:
Meiosis is a reduction division process in which cells divide to give daughter cells with half the number (haploid) of chromosomes. This is how gametes are produced.
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Meiosis II of spermatogenesis yields
a) Primary spermatocyces
c) Spermatogonia
d) Spežmatids
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e) spermatozoa
Which of the following statements are false?
A) An oocyte completes meiosis after a sperm penetrates it.
B) The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.
C) Fertilization occurs in the oviduct.
D) Effective hormonal contraceptives are currently available only for females.
E) Spermatogenesis and oogenesis require different temperatures.
F) Fragmentation is a type of asexual reproduction wherein an organism produces gemmules which are collections of many cells surrounded by a body wall.
G) Lobsters and insects can reproduce via fragmentation.
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?
Chapter 25 Solutions
What is Life? A Guide to Biology with Physiology
Ch. 25 - Prob. 1SACh. 25 - Prob. 2SACh. 25 - Prob. 3SACh. 25 - Prob. 4SACh. 25 - Prob. 5SACh. 25 - Prob. 6SACh. 25 - Prob. 7SACh. 25 - Prob. 8SACh. 25 - Prob. 9SACh. 25 - Prob. 10SA
Ch. 25 - Prob. 11SACh. 25 - Prob. 12SACh. 25 - Prob. 13SACh. 25 - Prob. 14SACh. 25 - Prob. 15SACh. 25 - Prob. 1MCCh. 25 - Prob. 2MCCh. 25 - Prob. 3MCCh. 25 - Prob. 4MCCh. 25 - Prob. 5MCCh. 25 - Prob. 6MCCh. 25 - Prob. 7MCCh. 25 - Prob. 8MCCh. 25 - Prob. 9MCCh. 25 - Prob. 10MCCh. 25 - Prob. 11MCCh. 25 - Prob. 12MCCh. 25 - Prob. 13MCCh. 25 - Prob. 14MCCh. 25 - Prob. 15MC
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- Why 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 mitochondriaarrow_forwardWhich statement does not accurately describe what occurs during the process of meiosis? A) All stages of meiosis follow DNA replication. B) Meiosis produces gametes with the haploid chromosome number. C) Meiosis produces four identical gametes, either egg or sperm. D) Genetic variation among sexually reproducing organisms is enhanced by meiosis. Not Gradedarrow_forwardDuring oogenesis, meiosis results in:A) four equally sized cells that stop dividing in meiosis 1B) 2 equally sized cells, but only one that is typically fertilizedC) 2 equally sized cells that are both typically fertilizedD) 2 or 3 small cells and one large cell that develops further if fertilizedarrow_forward
- What may be the most likely reason for the existence of polar bodies? A) They act as a back-up in case the secondary oocyte becomes non-viable. B) They may be fertilized and produce a viable twin. C) They provide a structure for half of the chromosomes after cellular division. D) They add a hormonal stimulus necessary to trigger ovulation. E) They are important additional sources of estrogen.arrow_forwardSperm need to be deposited in the vagina close to the time of ovulation because… a) Fertilisation needs to occur in the uterus b) The probability of fertilisation occurring in humans is about 25% c) The fusion of male and female gametes is the beginning of embryonic development d) Sperm and ovum are viable for a short time onlyarrow_forwardWhich of the following statements is incorrect? a) Sperm occur as X- or Y-chromosome bearing gametes b) The sex of an individual can not be determined from morphology early in embryonic development c) It is the ovum which determines the sex of the newly developing embryo d) X-chromosome bearing sperm are slightly larger than Y-chromosome bearing spermarrow_forward
- 1) Which statement below about asexual reproduction is FALSE? a) With asexual reproduction, offspring are genetically equivalent to the parent b) Asexual reproduction requires no partner c) Asexual reproduction requires meiosis d) Some organisms can reproduce both sexually and asexuallyarrow_forwardWhich of the following is inheritable?a) An altered gene in spermb) An altered gene in testesc) An altered gene in Zygoted) An altered gene in udder cellarrow_forwardWhat stimulates the completion of meiosis Il in a secondary oocyte? O a) A surge of Follicle-Stimulating Hormone (FSH) following the degeneration of the corpus luteum O b) A surge of Luteinising Hormone (LH) on day 13 of the menstrual cycle O) Sperm-egg binding at fertilisation d) Sperm-zona pellucida binding at fertilisationarrow_forward
- Which statements are true about meiosis? **Select 2 choice(s)** a) It increases the number of chromosomes. b)It duplicates the number of chromosomes by 2. c)It occurs in an organism's reproductive organs. d)It reduces the number of chromosomes by half. e)It occurs when a single haploid cell divides twice. f)It results in the formation of multiple diploid cells. Please I need a surely answer and a quicker responsearrow_forward#8arrow_forwardWhich of the following human cells is 1N and haploid? 1. a) Germinal epithelial cell 2. b) Primary spermatocyte 3. c) Spermatid 4. d) Type A1 Spermatogonium 5. e) Type B spermatogoniumarrow_forward
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