Biology Questions
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Today cheetah show extreme, genetic similarity. This is evidence of
The similarity of the fossil glyptodont to the living, modern, armadillo is an example of comparative anatomy
Which Hardy-Weinberg condition is violated by sexual selection?
When hiking high up the mountains, you find fossil marine shells lying about. This proved evidence that
Broccoli, kohlrabi, Brussels sprouts, Chinese cabbage, and cauliflower were all derived from the single wild species. This diversity is a result of
The artificial selection of different breeds of dogs is an example of speciation.
As you hike up a mountain, you realize that the plants and animals present at the base are not the same as those at the top. This observation is the basis of
In the process of natural selection individuals that are most fat are the ones that
Analogous structures are evidence of common ancestry.
Bacteria that cause ear infections have increased their resistance over time. Which of the following is the selective agent?
When comparing chick and pig ebryos the similar eyes, pharyngeal pouches and postnatal tails are evidence of
Which type of snail would be best suited to hide from predators if this population existed in a variable (mixed patches of light and dark areas) environment?
When an animal takes in more energy that is uses over an extended time, the extra chemical energy is stored as
How many chromosomes does a human cell have after meiosis 1?
What will the optic vesicles become?
Outline the reason why biological theories may change with time. Nature of Science: Falsification of theories with one theory being superseded by another- plant families have been reclassified as a result of evidence from cladistics.
similarities between prokaryotes, mitochondria and chloroplasts (3)
over evolutionary time, many cave-dwelling organisms have lost their eyes. tapeworms have lost their digestive systems. whales have lost their hind limbs. how can natural selection account for these losses?a) under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefitsb) natural selection cannot account for losses, only for innovationsc) the ancestors of those organisms experienced harmful mutations that forced them to find new habitats that these species has not previously used. d) natural selection accounts for these losses by the principle of use and disuse
a large population of laboratory animals has been allowed to breed randomly for a number of generations. after several generations, 49% of the animals display a recessive trait (bb), the same percentage as at the beginning of the breeding program. the rest of the animals show the dominant phenotype, with heterozygote individuals indistinguishable from the homozygous dominant individuals.what is the most reasonable conclusion that can be drawn from the fact that the frequency of allele b has not changed over time?a) the population is undergoing genetic driftb) the two phenotypes are equally adaptive under laboratory conditions c) the genotype BB is lethal d) there has been a high rate of mutation of allele B to allele b
which of the following statements regarding speciation is correct?a) speciation occurs so slowly the scientists have never observed the emergence of a new species.b) speciation only occurs slowly. small genetic changes accumulate from generation to generation.c) speciation can occur as a result of changes in a single gene.d) speciation requires the geographic isolation of a small population from a larger parent population.