Understanding phenotype–genotype relationships is difficult because of:
a. pleiotropy.
b. dominance.
c. epistasis.
d. A and C.
e. All of the above.
E
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Natural selection acts upon the ____ to create microevolutionary change
a. alleles in the gene pool of a population b. genotypic frequencies of a population c. alleles of an individual organism d. allele frequencies in a population e. phenotype of an individual organism
How do the muscles in your arm extend your arm outward?
A. The muscles in your arm push on the bones, causing your arm to extend. B. The muscles in your arm relax, and the tendons pull the arm straight. C. The top half of your bicep wraps around underneath the elbow like a rope over a pulley. When it contracts, the arm is pulled out straight. D. Some muscles in your arm relax, and others contract, pulling the arm straight.
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 phenylalanine and AUA codes for isoleucine B. AUA codes for isoleucine C. AAA codes for phenylalanine D. AAA codes for lysine and AUA codes for isoleucine E. AAA codes for lysine
Within a mycorrhizal relationship the fungi provide a greater surface area for mineral and water loss while the plant furnishes the fungi with sugars and amino acids.
Answer the following statement true (T) or false (F)