A sorus is ____

a. a fern spore
b. the fern gametophyte
c. an egg-producing structure
d. where the sperm are produced
e. a collection of sporangia


ANSWER: e

Biology & Microbiology

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Morgan's student Sturtevant demonstrated that the recombination frequencies between a series of linked genes is additive. Examine the following recombination data from Sturtevant, and determine the proper order of the genes on the Drosophila X chromosome. Assume y is in the 0.0 position.



A.  y m v w
B.  y w v m
C.  y m w v
D.  y w m v

Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain?
 
Gather Content
· What do you already know about recombination frequency?
 
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

During the end-Permian mass extinction:

A. oxygen levels in the deep oceans dropped. B. global warming occurred as a result of volcanic eruptions. C. oceans were acidified as a result of volcanic eruptions. D. oxygen levels in the deep oceans dropped and oceans were acidified as a result of volcanic eruptions. E. all of the answer options are correct.

Biology & Microbiology

What is meant by a mutation that Benzer referred to as nonrevertible?

What will be an ideal response?

Biology & Microbiology

Reef-building corals enter into a mutually beneficial relationship with photosynthetic protists called ________ as a means of obtaining food

Fill in the blank(s) with correct word

Biology & Microbiology