Assuming independent assortment, what proportion of the offspring of the cross AaBbCcDd × AabbCCdd will have the aabbccdd genotype?

What will be an ideal response?


zero

Biology & Microbiology

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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?

Biology & Microbiology

The basic unit of contraction in a skeletal muscle is ____

a. the cell b. the myofibril c. a sarcomere d. actin e. myosin

Biology & Microbiology

The process illustrated in the accompanying figure is known as:

a. humus formation. b. weathering. c. cation exchange. d. soil erosion. e. salinization.

Biology & Microbiology

What best describes whether a virus is likely to infect a particular cell?

A. The initial choice is random but once a cell type is chosen it becomes the preferred host. B. Viruses infect the first cells they encounter.  C. If a host cell is weakened, viruses are likely to infect it. D. Viruses only attack epithelial cells, such as the cells lining the lungs. E. A virus will only infect host cells with the correct surface receptors.

Biology & Microbiology