The acquisition of a relatively small amount of genetic material from an organism that is not a parent of the receiving organism is most specifically referred to as:
A. vertical descent.
B. horizontal gene transfer.
C. endosymbiosis.
D. parasitism.
E. Darwinian evolution.
B
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Imagine that you compare two DNA sequences found in the same location on homologous chromosomes. On one of the homologs, the sequence is AACTACGA. On the other homolog, the sequence is AACTTCGA
Within a population, you discover that each of these sequences is common. These sequences _____. A) contain an SNP that may be useful for genetic mapping B) identify a protein-coding region of a gene C) cause disease D) protect against disease E) do none of the listed actions
An excess of synonymous to non-synonymous differences the FoxP2 sequence of humans relative to the FoxP2 sequence of chimpanzees implies that:
A. FoxP2 is a highly conserved transcription factor. B. The function of FoxP2 has been under positive selection in the human lineage but that the expression pattern of FoxP2 has not. C. The expression pattern of FoxP2 has been under positive selection in the human lineage but that the function of FoxP2 has not. D. The function of FoxP2 has been under positive selection in the human lineage. No inferences regarding the effect of positive selection acting on the expression pattern of FoxP2 are possible based on these data.
Which of the following best describes mollusks?
A. They are bilaterally symmetrical and have a soft body always covered with a shell. B. They have radial body symmetry and a soft body always covered with a shell. C. They have radial body symmetry and a soft body sometimes covered with a shell. D. They are bilaterally symmetrical and have a soft body sometimes covered with a shell.
When using bacteria to clone a human gene and express its product, as in the case of insulin, the gene cannot contain introns because bacteria do not have the enzymes to process mRNA. How do scientists overcome this challenge?
What will be an ideal response?