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 13MC
Summary Introduction
Introduction:
The X and Y chromosomes are the ones that contain information for the sexual characteristics of a person. An individual with the genotype XX will show female characteristics, while one with XY will show male characteristics.
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Which of the following is TRUE about the mechanism of sex determination?
A) The product of the SRY gene converts the bipotential gonads into testes.
B) The development of an ovary is conditioned by the presence of two X chromosomes.
(C) Testosterone promotes the degeneration of the Mullerian duct.
D.
The ovary produces a Wolffian inhibition factor that causes the Wolffian duct to degenerate.
E) The "feminization" of accessory sex orgarts is promoted by the ovary.
With reference to sex determination in humans, discuss: i) X chromosome inactivation; and ii) Testicular feminization
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.
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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- With relevance to sex determination in humans, discuss: i) X chromosome inactivation; and ii) Testicular feminization Provide detail examples.arrow_forwardA homozygous mother has retinoblastoma, a dominant sex-linked disorder carried on the X chromosome. The father does not have this disorder. What is the chance they will have a child with this disorder? 1) 0% 2) 25% 3) 50% 4) 75% 5) 100% 身arrow_forwardSelect the FALSE statement/s: A) The functional layer of the endometrium sloughs off when estrogen levels are at their lowest but progesterone levels at their highest. 1 OB) Every month, the 20 secondary follicles release 20 ova. OC) XX genotypic female exposed to high levels of androgen in utero will develop male-like exfernal genitalia OD) Both A and B OE) Both B and Carrow_forward
- Daniel is an adult with XXY chromosomes. Since puberty, his penis has been unusually small. His voice never deepened, and he does not have chest or facial hair. He has breasts. Given this information regarding Daniel’s genetics and his ______ sex characteristics, Daniel may have a common type of intersexuality called ______.a) primary; Klinefelter syndromeb) primary; congenital adrenal hyperplasiac) secondary; Klinefelter syndromed) secondary; congenital adrenal hyperplasiaarrow_forwarda) Are X-linked recessive human genetic disorders more common in males or females and why? b) Define the term hemizygous. c) What region (gene) of the Y chromosome turns on other genes required for male development in a human embryo?arrow_forwardWhat causes most of the phenotypic abnormalities in someone with Down's Syndrome? A) They have many gene mutations that produce nonfunctional proteins. B) They express too much of some proteins during development. C) Their cells cannot go through mitosis properly during development because they have an odd number of chromosomes. D) Their chromosomes cannot pair during meiosis.arrow_forward
- Spermatogenesis and oogenesis both involve meiosis but differ in significant ways. One of those differences include what? A) Cytokinesis is unequal in spermatogenesis B) Production of sperm is continuous; in humans, and the number of future egg cells is set at birth C) Oogenesis is an uninterrupted sequence, but there are long delays in spermatogenesis D) All of the abovearrow_forwardWhich of the following is NOT TRUE? A) Menopause is marked by elevated levels of gonadotropins. A spermatozoon can survive for more than five days in a female reproductive tract. C) The proliferative endometrial phase is promoted by progesterone. Synthetic estrogens act as contraceptives by preventing the ovarian luteal phase. The hormonal basis of stress-induced amenorrhea is due to the influence of the limbic system on GNRH secretion.arrow_forwardWhich of the following is likely to happen when you remove the testes of an adult male rat? a) Decrease in follicle stimulating hormone. b) Decrease in the level of gonadotropin releasing hormone. c) Increase in testosterone levels. d) Increase in the level of follicle stimulating hormone.arrow_forward
- 1.) If the chromosome number in a sepematogonium is 24, what will be the chromosome number in each sperm after the completion of spermatogenesis? a.) 12 b) 24 c) 48 d.) 6 2.) The ability to roll your tongue is controlled by a dominant allele (T); people who have two copies of the recessive allele (t) cannot role their tongues. A cross between parents whose genotypes are TT and tt will produce a family with which of the following phenotypes? Question 1 options: a.) all will be tongue-rollers b.) none will be tongue-rollers c.) half will be tongue-rollers, d.) half will not be tongue-rollers e.) 75% will be tongue-rollers, f.) 25% will not be tongue-rollers. 3.) The gene for white eye colour is present on the X-chromosome in Drosophila, and is a recessive trait. A female fly with white eyes in the F1 generation can be produced if it inherits an X-chromosome with Question 48 options: a.) recessive allele from father only b.) recessive allele from mother only c.) recessive alleles…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_forwardThe fraternal birth order effect, in which the number of brothers a boy's mother carried before him influences his likelihood of growing up to be gay, is a) the result of social influences from the older brothers. b) the result of a genetic mutation. c) proof that sexual orientation is a matter of choice. d) only apparent in boys who are right-handed.arrow_forward
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