You are a paleontologist trying to find fossils that represent intermediate forms in an evolutionary transition. Which of the following pieces of information could help you identify a geological formation for your search?
a. Based on the fossil record the evolutionary transition must have taken place 210 to 230 million years ago.
b. Transitional fossils likely had long spines.
c. The organisms' hard shells would have made fossilization likely.
d. The transition is predicted to have taken place in shallow inland seas.
e. A and D.
E
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In Jabberwocks, flame eyes (F) are dominant to blue eyes (f) and burbling (B) is dominant to whistling (b). Jabberwock geneticists suspect that the two genes are linked on one of the autosomes
They mate a true-breeding flame-eyed, burbling female with a true-breeding blue -eyed, whistling male. They then remove a sample of gametes from one of the resulting offspring. If the genes are linked, which of the following is/are a recombinant gamete genotype? Select all correct choices: A. FB B. Fb C. fb D. fB E. none of these is a recombinant gamete genotype
Lactobacillus contributes to the antimicrobial defenses for the adult female reproductive tract by making lactic acid to lower the pH.
Answer the following statement true (T) or false (F)
If one strand of DNA has the nitrogenous base sequence ATTCGACGCTA, then the complementary strand has the nitrogenous base sequence
a. TAAGCTGCGAT. b. ATCGCAGCTTA. c. UAAGCUGCGAU. d. ATTCGACGCTA
Clonal selection produces plasma cells that _________.
A) can differentiate into memory cells B) can live for years C) are different from one another and produce different antibody molecules D) are identical to one another and produce identical antibody molecules