The number of the greater prairie chicken, a bird found in the prairies of Illinois, was drastically reduced during the 19th and 20th centuries due to hunting and habitat destruction. The number of the birds went from millions to fewer than 50. When the population rebounded to over 5,000, more than 30% of the alleles were lost forever. The allele loss in the above example is mostly due to__________________.
A. More information needed.
B. Natural Selection
C. Sexual Selection
D. Genetic Drift
Ans: D. Genetic Drift
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Cacti in the deserts of southwestern North America and some euphorbs of the deserts of Africa, have barrel-shaped stems, short-lived leaves, and spines, yet these two types of plants are from different evolutionary lineages. This is an example of
A. selective breeding. B. transitional forms. C. homologous traits. D. convergent evolution.
Turner Syndrome (XO) is the only viable monosomy found in humans. Some sex chromosome trisomies are also viable, including XXX, XXY, and XYY. There are no viable autosomal monosomies, and a small handful of viable
autosomal trisomies exist, such as trisomy 21 (Down syndrome), and trisomy 13 and 18, both of which are lethal within the first year of life. Clearly, aneuploidy is not tolerated well in humans. Speculate as to why there are so few viable monosomies (only one) in humans, and why there are so few viable trisomies. Also, speculate as to why aneuploidy involving the sex chromosomes is better tolerated than those involving autosomes.
What will be an ideal response?Suppose a geneticist sequences a specific gene region in two species, A and B, previously known to be closely related. He specifically wants to see which of the two species is closer to an ancestral species
The sequence comparison showed that this region in species B has an extra intron, unlike other near relatives, but that otherwise A and B are virtually the same for this region. Based on this data alone, he could reason that which species was more likely ancestral?
The pathology associated with food infections does not involve toxin-induced damage.
Answer the following statement true (T) or false (F)