Answer the following question given this paragraph: 7.3 Errors in Meiosis The number, size, shape, and banding pattern of chromosomes make them easily identifiable in a karyogram and allow for the assessment of many chromosomal abnormalities. Disorders in chromosome number, or aneuploidies, are typically lethal to the embryo, although a few trisomic genotypes are viable. Because of X inactivation, aberrations in sex chromosomes typically have milder effects on an individual. Aneuploidies also include instances in which segments of a chromosome are duplicated or deleted. Chromosome structures also may be rearranged, for example by inversion or translocation. Both of these aberrations can result in negative effects on development, or death. Because they force chromosomes to assume contorted pairings during meiosis I, inversions and translocations are often associated with reduced fertility because of the likelihood of nondisjunction. Q: The number, size, shape, and banding pattern of chromosomes make them easily identifiable in a karyogram and allow for the assessment of many chromosomal Choices: - nutrients - processes - beliefs - abnormalities A:
abnormalities
Answer the following question given this paragraph: Regular weight-bearing exercise can reduce the risk of osteoporosis. Apply lesson concepts to explain why. Q: Regularly performing weight-bearing exercise can reduce the risk of what condition that affects bones? Choices: - psoriasis - marrow deficiency - arthritis - osteoporosis A:
osteoporosis
Q: Answer the following question given this paragraph: Q: What bodily structures consist of the endothelium and its basal lamina? Choices: - veins - muscles - fibers - capillaries A:
A: capillaries
Question: Answer the following question given this paragraph: Q: When conditions deteriorate, hydras can reproduce sexually, forming resistant zygotes that remain dormant until when? Choices: - Hydras choose - Temperature rise - Spring - conditions improve A:
Answer: conditions improve
*Question*
Answer the following question given this paragraph: Which of the following statements about the male reproductive system is false? a. The vas deferens carries sperm from the testes to the penis. Sperm mature in seminiferous tubules in the testes. Both the prostate and the bulbourethral glands produce components of the semen. The prostate gland is located in the testes. Sperm mature in seminiferous tubules that are coiled inside the testes, as illustrated in Figure 43.8. The walls of the seminiferous tubules are made up of the developing sperm cells, with the least developed sperm at the periphery of the tubule and the fully developed sperm in the lumen. The sperm cells are mixed with "nursemaid" cells called Sertoli cells which protect the germ cells and promote their development. Other cells mixed in the wall of the tubules are the interstitial cells of Leydig. These cells produce high levels of testosterone once the male reaches adolescence. When the sperm have developed flagella and are nearly mature, they leave the testicles and enter the epididymis, shown in Figure 43.8. This structure resembles a comma and lies along the top and posterior portion of the testes; it is the site of sperm maturation. The sperm leave the epididymis and enter the vas deferens (or ductus deferens), which carries the sperm, behind the bladder, and forms the ejaculatory duct with the duct from the seminal vesicles. During a vasectomy, a section of the vas deferens is removed, preventing sperm from being passed out of the body during ejaculation and preventing fertilization. Semen is a mixture of sperm and spermatic duct secretions (about 10 percent of the total) and fluids from accessory glands that contribute most of the semen's volume. Sperm are haploid cells, consisting of a flagellum as a tail, a neck that contains the cell's energy-producing mitochondria, and a head that contains the genetic material. Figure 43.9 shows a micrograph. Q: Where do sperm go after leaving the testicles and before entering the vas deferens? Choices: - clitoris - anus - skin - epididymis A:
**Answer**
epididymis
(Q).
Answer the following question given this paragraph: Viewing distant stars is looking back in time. The stars we see are many thousands of light years away, which means the light takes many thousands of years to reach us. Thus the stars we see in the sky are how they looked thousands of years ago. Q: The distance of stars is measured in what terms, meaning the light takes many thousands of years to reach us? Choices: - light months - light decades - light hours - light years A:
(A).
light years