Why do many plants use the photoperiodic pathway to regulate the timing of flower formation?
A. This allows plants to link flowering to day length, which corresponds to the season when conditions are optimal.
B. Flower petals carry out high levels of photosynthesis and require high light conditions.
C. A minimum amount of light is always necessary for flowering.
D. This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal.
Answer: A
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List the animal phyla that are protostomes and those that are deuterostomes.
What will be an ideal response?
Although attempts to date the divergence between humans and chimpanzees using molecular sequence data do not perfectly agree, a rough consensus from multiple analyses would place the divergence date at ________
A) 175,000 years ago B) 6,000 years ago C) 5 to 7 million years ago D) 3.14 million years ago E) 65 million years ago
When hybrids in a hybrid zone can breed with each other and with both parent species and also have equal fitness to the parent species, one would predict that __________.
a. the hybrid zone will remain stable b. reinforcement of reproductive barriers will keep the parent species separate c. the species will fuse d. allopatric speciation will occur e. a new hybrid species will form by sympatric speciation
It only takes a matter of several hours to sequence 1,000 base-pair sections of DNA.
Answer the following statement true (T) or false (F)