Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 49, Problem 14TYK
Summary Introduction
To review:
The structure that protects the oocyte and egg from attack by antibodies in the human female.
Introduction:
Sertoli cells are present in the human male reproductive system. These are are present in the seminiferous tubules of the testis. Sperms are also produced in the seminiferous tubules. Sertoli cells are supportive cells surrounded by the developing spermatocytes in the seminiferous tubules.
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answer the question below, multiple answer is possible while if all choices are not applicable, provide the proper answer
(a) What are the genotypic differences between F- cells, F+ cells, and Hfr
cells?
(b) What are the phenotypic differences?
(c) By what mechanism are F- cells converted to F+ cells? F+ cells to Hfr cells?
Hfr cells to F+ cells?
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For the following mechanism that is thought to contribute to maternal–fetal tolerance, state whether you would consider it to be an example of T cell tolerization, control of responses by regulatory lymphocytes, immune deviation or immune privilege:
a) Placental cells express FasL and can kill Fas-expressing maternal T cells.
Chapter 49 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 49.1 - Prob. 1SBCh. 49.2 - What are egg coats, and what is their function?...Ch. 49.2 - Prob. 2SBCh. 49.3 - Outline the roles of follicle-stimulating hormone...Ch. 49.4 - How does the oral contraceptive pill prevent...Ch. 49 - Prob. 1TYKCh. 49 - Which of the following processes does not increase...Ch. 49 - Prob. 3TYKCh. 49 - Prob. 4TYKCh. 49 - The slow block to polyspermy: a. is caused by a...
Ch. 49 - Prob. 6TYKCh. 49 - Prob. 7TYKCh. 49 - Prob. 8TYKCh. 49 - Prob. 9TYKCh. 49 - Prob. 10TYKCh. 49 - Prob. 11TYKCh. 49 - Prob. 12TYKCh. 49 - Prob. 13TYKCh. 49 - Prob. 14TYKCh. 49 - Prob. 15TYKCh. 49 - Prob. 16TYKCh. 49 - Prob. 17TYKCh. 49 - Prob. 18TYKCh. 49 - Prob. 1ITDCh. 49 - Prob. 2ITDCh. 49 - Prob. 3ITD
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- For the following mechanism that is thought to contribute to maternal–fetal tolerance, state whether you would consider it to be an example of T cell tolerization, control of responses by regulatory lymphocytes, immune deviation or immune privilege: a) Tissues at the maternal–fetal interface are populated with non-professional APCs that lack costimulatory moleculesarrow_forwardCancers of the breast can be categorized in many ways, one of which is whether the tumors are estrogen receptor (ER)-positive or -negative. A) What does the ER do and how does it function? B) What kinds of conclusions can be drawn about the tumors based on their ER status? (i.e. how are they sustained in their growth?) implications? C) What might be the treatment/therapeuticarrow_forwardPlease draw if needed .... show your workarrow_forward
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- 7. Maternal effect: In Limnaea snail cats, R makes right coiled shells; r makes left coiled shells, and R is dominant to r, as we discussed in class. Even though these can be hermaphrodites, and act either as mom or dad, we'll just pretend they are male or female. A Rr male marries an rr female. a) What are the genotypes of their offspring and in what ratio? b) What are the phenotypes of their offspring and in what ratio?arrow_forwardexplain the most likely steps of what might happen inside a healthy mammary gland epithelial cell after it is exposed to UV light.arrow_forwardWhich of the following is true about sex determination in mammals? Choose all possible answers. a.) The conversion of the genital ridge into the bipotential gonad requires the Sf1, Wt1, and Lhx9 transcription factors. b.) Even if one of the transcription factors mentioned in choice a (Sf1, Wt1, and Lhx9) will lose its function, the normal development of either male or female gonads will still push through. c.) Sry protein binds to the enhancer of the Sox9 gene and elevates expression of this key gene in the ovary-determining pathway. d.) β-catenin functions to initiate the ovarian pathway of development by activating the genes involved in granulosa cell differentiation. e.) Sf1 protein prevents the production of Sox9.arrow_forward
- What is the trophoblast? What are three ways it prevents an immune response?arrow_forwardWhich of the following is NOT a true statement? (Check all that apply) A Prior to migration, all neural crest cells undergo EMT. B) Prior to migration, trunk neural crest cells undergo MET. C) All neural crest cells differentiate into their final derivatives at the site of their induction. D Neural crest cells are functionally equivalent to multipotent stem cells. E) The neural crest is specified where Wnt induces BMP and is then turn off. F The cranial neural crest contributes to the development of the tooth. G) All neural crest cells migrate dorsally from their induction site. H) Early migrating trunk neural crest cells are specified to become melanoblasts. O Ventrally migrating trunk neural crest cells that are responsive to Wnt and NT3 will become glial cells if they express Notch. Cranial neural crest cells all migrate ventrally from their site of specification.arrow_forwardFigure 42.16 The Rh antigen is found on Rh positive red blood cells. An Rh-negative female can usually carry an Rh-positive fetus to term without difficulty. However, if she has a second Rh-positive fetus, her body may launch an immune attack that causes hemolytic disease of the newborn. Why do you think hemolytic disease is only a problem during the second or subsequent pregnancies?arrow_forward
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