You observe an individual of your favorite study organism expressing the dominant phenotype for a certain trait. How would you go about determining if the individual was homozygous dominant or heterozygous for that trait?
What will be an ideal response?
Perform a test cross with a recessive homozygous individual: If Aa × aa offspring are Aa : aa in a 1:1 ratio, and if AA × aa → all offspring are Aa heterozygotes.
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The way in which an organism utilizes its environment may be called
A. resource partitioning. B. its habitat. C. competitive exclusion. D. intraspecific competition. E. its niche.
What property of dishwashing liquid (detergent) makes it useful to wash grease from pans?
a. solubility in water b. permeability c. hydrophobic nature d. amphipathic nature
Suppose you have three water baths in front of you. The temperature of the one on the left is 22°C (cold), the one in the middle is 25°C (room temperature), and the one on the right is 44°C (warm). At the same time, you place the index finger of your
right hand into the warm water bath and the index finger of your left hand into the cold water bath, and you leave them there for 2 minutes. After 2 minutes, why would you no longer feel a difference in temperature between the two water baths? A) The sensory receptors in your index fingers speed up the conversion of the stimulus (water) to a chemical signal. B) The sensory receptors in your index fingers diminish the conversion of the stimulus (water) to an electrical signal. C) The sensory receptors in your index fingers become less sensitive over time as they are stimulated repeatedly. D) Receptor potentials in the sensory receptors in your index fingers start off weak and then become stronger.
A scientist makes three artificial mRNA strands: (x) 5' AAAUUUAAAUUUAAAUUUAAAUUUAAA 3'(y) 5' UUUCCCUUUCCCUUUCCCUUUCCCUUU 3'(z) 5' AUAUAUAUAUAUAUAUAUAUAUAUAU 3'When he analyzes the polypeptides produced, he finds that:x produces a polypeptide that is 50% phenylalanine and 50% lysine.y produces a polypeptide that is 50% phenylalanine and 50% proline.z produces a polypeptide that is 50% isoleucine and 50% tyrosine.Based on these results only, the best conclusion to make is that
A. AAA codes for lysine. B. AAA codes for phenylalanine. C. AUA codes for isoleucine. D. AAA codes for lysine and AUA codes for isoleucine. E. AAA codes for phenylalanine and AUA codes for isoleucine.