Final Exam Book and Mastering questions Bio 191 100% Correct!

How does internal fertilization facilitate life on land? - ANSWERInternal fertilization allows the sperm to reach the egg without either gametes drying out If a hermaphrodite self-fertilizes will the offspring by identical to the parent? Explain? - ANSWERNo. Owing to random assortment of chromosomes during meiosis the offspring may receive the same copy or different copies of a particular parental chromosome from the sperm and the egg. Furthermore, genetic recombination during meiosis will result in reassortment of genes between pairs of parental chromosomes. In what ways are a second polar body and an early spermatid similar? In what ways are they dissimilar? - ANSWERBoth have a haploid DNA content and very little cytoplasm. However the early spermatid will develop into a functional gamete, whereas a polar body is a by-product of oocyte production Why might using a hot tub frequently make it harder for a couple to conceive a child? - ANSWERSpermatogenesis occurs normally only when the testicles are cooler than the rest of the body. Extensive use of a hot tub can cause a decrease in sperm quality and number How are the uterus of an insect and the ovary of a flowering plant similar in function? How are they different? - ANSWERLike the uterus of an insect the ovary of a plant is the site of fertilization. Unlike the plant ovary the uterus is not the site of egg production which occurs in the insect ovary. In addition, the fertilization insect egg is expelled from the uterus, whereas the plant embryo develops within a seed in the ovary If each vas deferens in a male was surgically sealed off, what changes would you expect in sexual response and ejaculate composition? - ANSWERThe only effect of sealing of each vas deferens is an absence of sperm in the ejaculate. Sexual response and ejaculate volume are unchanged. The cutting and sealing off of these ducts, a vasectomy, is a common surgical procedure for med who do not wish to produce any (more) offspring FSH and LH get their names from events of the female reproductive cycle but they also functions in males. How are their functions in females and males similar? - ANSWERIn both females and males, FSH encourages the growth of cells that support and nourish developing gametes (follicle cells in females and Sertoli cells in males), and LH stimulates the production of sex hormones that promote gametogenesis ( estrogens, primarily estradiol, in females and androgens, especially testosterone, in males)