c. All eight possible phenotypes could occur, but a greater proportion of the offspring would have the parental phenotypes
When genes are linked they do not assort independently. Instead, the alleles on the parental chromosome will have a tendency to migrate together to the same pole of the cell. To produce gametes with genotypes different than the parentals crossing over must happen between the genes of homologous chromosomes during meiosis. However, recombination is a rare event, so the recombinant gametes will be less frequent than the parentals (those that arise when no recombination occurs between genes) and for that reason a greater proportion of the offspring will have parental phenotypes.
Answer: (D) It is composed of a single strand of nucleotides.
Explanation: Ribonucleic acid (RNA), unlike DNA, is usually <u>single-stranded.</u> A <u>nucleotide in an RNA chain will contain ribose (the five-carbon sugar), one of the four nitrogenous bases (A, U, G, or C), and a phosphate group.</u>