A cross between two pea plants results in 732 purple and 268 white plants. What is (are) the genotype(s) and phenotype(s) of the parents that produced these offspring?
A. One parent is homozygous purple; second parent is heterozygous white.
B. One parent is heterozygous purple; second parent is heterozygous white.
C. Both parents are heterozygous purple.
D. One parent is homozygous purple; second parent is homozygous white.
E. One parent heterozygous purple; second parent homozygous white.
Answer: C
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a. is homozygous recessive b. shows the recessive phenotype c. shows no symptoms d. is homozygous dominant e. is always male
The last common ancestor of fungi, mammals, and archaea likely had which of the following characteristics?
A. both a plasma membrane and a circular chromosome B. both a circular chromosome and membrane-bound organelles C. both free-floating genetic material (DNA) and a distinct nucleus D. both membrane-bound organelles and a circular chromosome E. both a distinct nucleus and a plasma membrane
Upon stimulation by a peptide hormone, the target cell converts ATP to the second messenger,
___________________. Fill in the blank(s) with the appropriate word(s).
In the study of cultural evolution, what is a "meme"?
A. A unit of cultural inheritance B. A humorous piece of media that is rapidly spread on the internet C. Early attempts at music and art by human ancestors D. Information spread as a disease rather than as inheritance of a gene E. Genetic memory that we have inherited from our ancestors and use without realizing it