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Researchers (Helle et al., 2004) analyzed rates of twin births in the Sami population of Northern Scandinavia during the eighteenth and nineteenth centuries. They found that (1) a baby born from a singleton pregnancy was more likely to survive to adulthood than a baby born from a twin pregnancy, and (2) the average number of offspring raised to adulthood was higher for women who had twins than for those who never had twins. These data suggest that in this population , human twinning rate was
a. under direction selection
b. under stabilizing selection
c. under disruptive selection
d. under sexual selection
e. undergoing genetic drift
Bacteriophage is a virus which infects a bacterium and which is many times used in molecular genetics experiments as the vector, or cloning vehicle. Recombinant phages can be made
CHF complicating IE is primarily the result of valve destruction or distortion or rupture of chordae tendinae. Intracardiac fistulas, myocarditis, or coronary artery embolization m
How many different molecules composed of (A) two (B) three, and (C) four amino acids, linked together by peptide bonds, can be made from the set of 20 naturally occurring amino aci
What are the four types of weak bonds, and how do they differ from each other and from covalent bonds? When you eat a salad with lettuce, croutons, hard-boiled egg, bacon bits,
Inhibitor Proteins - Enzyme-activity Control One kind of inhibitor protein found in higher plants is an endopeptidase which degrades nitrate reductase thus causing irreversibl
what are the general characteristicss of porifera
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The difference in electrical charge between two points: Select one: is called the potential difference between those points. is called the diffusion potential between those p
When do you use the term 2' carbon and when do you use 2 carbons on a molecular structure? I need examples please!
Foot-rot Foot-rot is a term applied to the condition of feet of cattle, sheep, goats and sometimes pigs. It is characterized by inflammation, necrosis and ulceration of underly
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