In tetrad analysis, NPD asci can result from (Select all that apply.)
A) independent assortment of unlinked genes.
B) double crossovers between linked genes.
C) single crossovers between linked genes.
D) single crossovers between a gene and a centromere.
A) independent assortment of unlinked genes,
B) double crossovers between linked genes.
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You are a landscape architect working on the grounds of a large estate. After you plant a dozen trees, the owner says, "There's been a mistake. The flowers on some of these willow trees look totally different! I specifically asked for Salix alba. You must have planted two different species." You refer to your tree guide, and read: "Salix alba - species of willow native to Europe and Asia, noted for the white undersides of leaves. Insect pollinated, dioecious. Grows 10-30m tall." How do you respond to the client?
A. "Sorry about that sir, I will dig up the wrong trees right away." B. "Don't worry, the trees with the smaller flowers just haven't undergone phase change yet." C. "Don't worry, when the shorter trees reach full size, they will grow the other kind of flower." D. "Don't worry, Salix alba is dioecious, meaning each tree has either male or female flowers. That is why they look different." Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about dioecious species? What other information is related to the question? Choose Answer Given what you now know, what information 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?
What structure stores waste produced in the cell?
A. vacuole B. nucleus C. lysosome D. pinocytic vesicle
What organism is at the first trophic level in a tallgrass prairie ecosystem?
A. Birds B. Grasshoppers C. Grasses D. Decomposers E. Parasites
Which statement about binary fission is true?
A) It is the cell division process of prokaryotic cells. B) It is the cell division process of both prokaryotic and eukaryotic cells. C) It occurs during S phase of the cell cycle. D) It is part of interphase.