Question 13 In humans, what occurs during fetal development of the male phenotype? O FSH activates spermatogenesis during month 5 of fetal development O Expression of TDF from the X chromosome leads to male development O Testosterone changes the undifferentiated external genitalia into a penis and scrotum O Testosterone causes degeneration of the uterus and vagina Question 14 Fill in the blank:: In the reproductive system, GnRH _______________ O directly stimulates testes secretion of testosterone O is produced by the ovarian follicle O stimulates LH and FSH release by the anterior pituitary O causes glycogen secretion from the endometrium O converts the follicle into the corpus luteum Question 15
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The Y chromosome contains a gene called the SRY gene, which codes for a protein called testis-determining factor (TDF). This protein is responsible for initiating the development of the testes. So, the correct answer to question 13 is: Expression of TDF from the Show more…
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QUESTION 8 Fertilization occurs in the _________. Oviduct Ovary Uterus Vagina QUESTION 9 Match the hormones below with the key roles that each has in the female reproductive cycle: Estrogen LH Progesterone A. causes LH to increase B. causes ovulation C. causes the uterine lining to thicken QUESTION 10 ___________________is to the production of mature sperm as _____________is to the production of mature ova. meiosis, mitosis oogenesis, spermatogenesis mitosis, meiosis spermatogenesis, oogenesis QUESTION 11 ________________, the joining of egg and sperm, occurs in the oviducts Spermatogenesis Mitosis Fertilization Oogenesis QUESTION 12 Which of the following is the term given to the single cell that results from fertilization? Embryo Blastocyst Zygote Gastrula QUESTION 13 Pregnancy is divided into three trimesters, each about three months long. Match each trimester with the proper activity. 1st trimester 2nd trimester 3rd trimester A. formation of organs B. growth C. preparing for birth QUESTION 14 Which of the following cells are diploid? Egg Sperm Zygote Gamete
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In both females and males, gamete formation is controlled by the HPGA. The hypothalamus releases GnRH which acts on the anterior pituitary and causes the release of FSH. In males, FSH acts on Sertoli cells while in females it stimulates follicles to develop. In males, the FSH triggers its target cells to produce Sertoli cells that will promote sperm cell production. In males, LH causes Leydig cells to produce excess testosterone that will promote sperm cell production. In females, estrogens from the growing follicle triggers a spike in LH resulting in ovulation. In males, excess testosterone causes feedback inhibitor APB (Androgen Binding Protein) to be released and act as a negative feedback inhibitor. In females, the remnants of the follicle, the corpus luteum, produces progesterone and estrogen. Those hormone levels drop as the structure degenerates into the corpus albicans and menstruation occurs following ovulation.
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