Answer the following question given this paragraph: Mistakes may occur during meiosis that result in nondisjunction . This is the failure of replicated chromosomes to separate during meiosis (the animation at the link below shows how this happens). Some of the resulting gametes will be missing a chromosome, while others will have an extra copy of the chromosome. If such gametes are fertilized and form zygotes, they usually do not survive. If they do survive, the individuals are likely to have serious genetic disorders. Table below lists several genetic disorders that are caused by abnormal numbers of chromosomes. Most chromosomal disorders involve the X chromosome. Look back at the X and Y chromosomes and you will see why. The X and Y chromosomes are very different in size, so nondisjunction of the sex chromosomes occurs relatively often. http://learn. genetics. utah. edu/content/begin/traits/predictdisorder/index. html. Q: What is the failure of replicated chromosomes during meiosis to separate known as? Choices: - pollenation - regression - separation - nondisjunction A:
nondisjunction
(Question)
Answer the following question given this paragraph: It is not yet clear why biodiversity increases closer to the equator, but hypotheses include the greater age of the ecosystems in the tropics versus temperate regions, which were largely devoid of life or drastically impoverished during the last ice age. The greater age provides more time for speciation. Another possible explanation is the greater energy the tropics receive from the sun versus the lesser energy input in temperate and polar regions. But scientists have not been able to explain how greater energy input could translate into more species. The complexity of tropical ecosystems may promote speciation by increasing the habitat heterogeneity, or number of ecological niches, in the tropics relative to higher latitudes. The greater heterogeneity provides more opportunities for coevolution, specialization, and perhaps greater selection pressures leading to population differentiation. However, this hypothesis suffers from some circularityecosystems with more species encourage speciation, but how did they get more species to begin with? The tropics have been perceived as being more stable than temperate regions, which have a pronounced climate and day-length seasonality. The tropics have their own forms of seasonality, such as rainfall, but they are generally assumed to be more stable environments and this stability might promote speciation. Regardless of the mechanisms, it is certainly true that biodiversity is greatest in the tropics. The number of endemic species is higher in the tropics. The tropics also contain more biodiversity hotspots. At the same time, our knowledge of the species living in the tropics is lowest and because of recent, heavy human activity the potential for biodiversity loss is greatest. Q: Where do you find the greatest biodiversity? Choices: - in shallow lakes - in the tundra - at the poles - in the tropics A:
(Answer)
in the tropics
Ques: Answer the following question given this paragraph: Taste receptors are found in tiny bumps on the tongue called taste buds (see Figure below ). There are separate taste receptors for sweet, salty, sour, bitter, and meaty tastes. The meaty taste is called umami . You can learn more about taste receptors and the sense of taste by watching the animation at the following link: http://www. bbc. co. uk/science/humanbody/body/factfiles/taste/taste_ani_f5. swf . Q: What are the taste receptors found as tiny bumps on the tongue called? Choices: - ear buds - fat buds - hard buds - taste buds A:
Ans: taste buds
(Q).
Answer the following question given this paragraph: In comparing two solutions of unequal solute concentration, the solution with the higher solute concentration is hypertonic, and the solution with the lower concentration is hypotonic. Solutions of equal solute concentration are isotonic. Q: The solution with the higher solute concentration is called what? Choices: - hypotonic - unsaturated - acetic - hypertonic A:
(A).
hypertonic
Ques:Answer the following question given this paragraph: Q: What are double sugars called? Choices: - monosaccharides - sodiums - silicates - disaccharides A:

Ans:disaccharides
Answer the following question given this paragraph: Insects are the only invertebrates than can fly. Flight is the main reason for their success. Q: The only invertebrates than can fly belong to what broad group, which is highly successful? Choices: - spiders - birds - bats - insects A:
insects