Which of the following is missing in parasitic flatworms compared to the free-living flatworms?
A. eyespots
B. excretory system
C. testes
D. digestive tract
Answer: A
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(Note the phylogeny is drawn with diagonal branches rather than the rectangular branches seen in the text.) If the stop codon in the Brassica plant CAL gene appeared in the cauliflower lineage after broccoli and cauliflower had diverged from each other, it would be expected that
A. both broccoli and cauliflower flowers would be arrested as buds.
B. both broccoli and cauliflower would develop flowers normally.
C. broccoli would develop flowers normally, and cauliflower flowers would be arrested as buds.
D. cauliflower would develop flowers normally, and broccoli flowers would be arrested as buds.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about the CAL gene?
Consider Possibilities · Consider the different answer options. Which can you rule out?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The adjustable ring of muscular tissue that controls the amount of light entering the eye is the:
a. lens b. cornea c. pupil d. iris e. retina
Hybridization of DNA is _____ and is driven entirely by _____
a. non-spontaneous; ATP b. non-spontaneous; hydrogen bonding c. non-spontaneous; glycolysis d. spontaneous; ATP e. spontaneous; hydrogen bonding
If two copies of a gene are identical alleles, the condition is referred to as
a. homozygous. b. heterozygous. c. hybrid. d. dominant. e. codominant.