New genes are introduced into a gene pool by
A. evolution.
B. spontaneous mutations.
C. natural selection.
D. inheritance of acquired characteristics.
B. spontaneous mutations.
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List the components of a homeostatic feedback loop. Use the regulation of fluid volume to illustrate your answer.
What will be an ideal response?
The identity of flower organs is specified by the spatial expression of three classes of homeotic genes
A. true B. false
The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which species has the greatest number of ancestral character states (pleisiomorphies)?
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6
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 cladistics?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
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?
A population that is in genetic equilibrium is said to ____
a. have an equal number of homozygotes as heterozygotes for a given trait b. deviate from the Hardy-Weinberg law c. require genetic testing for estimation of allele frequencies d. lose genetic variation with each generation e. have an allele or alleles that remain constant generation to generation