In many organisms, one set of chromosomes comes from the maternal parent, while the other set comes from the paternal parent. Similar chromosomes in these sets are said to be _________
A. morphs
B. alleles
C. haploid
D. homologs
E. physiological traits
D
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Now, time rolls inexorably along. One hundred thousand years after the original event, yet more rodent-philic descents return to the island and repeat the sampling process
There are now twice as many fixed differences between A1 and A2, relative to the 50,000 years after vicariant event table. Unlike last time, you find that individuals from A1 cannot reproduce with individuals from A2. Compare the DNA sequences presented above and give the amount of variation expected: ...between two randomly chosen individuals of A1. A. relatively low variation B. moderate variation C. relatively high variation
Scientists use mitochondrial DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, mitochondrial DNA samples taken from ____ would have the most unique mutations, representing the original and oldest DNA sequences.
A. Africa B. Asia C. Australia D. Europe E. the Americas
The system of flexing and extending muscles makes movement of appendages easy to understand. But how are some actions possible (sticking out your tongue, beating of your heart) when these structures have no bone structure with opposing flexors and extensors in them?
A. Muscle cells running diagonally or crosswise amidst the longitudinal muscles must contract and force the long relaxed muscle cells to elongate. B. These structures must be empty chambers, and fluids forced into them expand them. C. One set of muscle cells must therefore be able to both contract and expand. D. This cannot be explained at present.
Which of the following conditions would be the LEAST likely to cause hyperventilation?
A) Ketoacidosis B) Severe infection C) Aspirin overdose D) Metabolic alkalosis