Some organisms do not have crossing over, and hold their homologous chromosomes together via
some other mechanism. Even though crossing over leads to genetic diversity, the absence of crossing
over in these organisms does not prevent the production of diverse gametes. Why is this?
What will be an ideal response?
Independent assortment also leads to genetic diversity, and the more chromosome pairs there are, the
more possible gamete types can be produced even in the absence of crossing over.
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Septa divide the actinomycete mycelia into cells, each containing a single nucleus.
Answer the following statement true (T) or false (F)
You are at the aquarium looking at a freshwater mammal tank and a manatee swims close to the glass. On his front flippers you see fingernails. You think, what possible use could fingernails be to a manatee, then you realize they are of no use at all. Which of the following best explains the presence of fingernails on a manatee?
A. they are remnants of the bones used by fish for their fins. B. they are homologous structures. C. the bones are protruding from the fins and only look like fingernails, even though every manatee in the tank looks like it has fingernails. D. convergent evolution has occurred. E. they are vestigial structures.
Given these blood vessels in the kidney:
1) afferent arteriole 2) arcuate artery 3) interlobar artery 4) interlobular artery Which of these sequences represents the correct pathway a red blood cell would follow as it moved from the renal artery to the glomerulus? A. 1,2,3,4 B. 2,3,4,1 C. 2,1,4,3 D. 3,2,4,1 E. 4,3,2,1
When using vectors to produce proteins for gene therapy, what are some of the problems that may occur and how has medical science overcome these problems?
A. cDNA produced by vectors active an immune response, tags are therefore added to help the body identify them as self. B. Proteins injected using vectors get degraded too quickly and therefore protective segments have been added to the proteins. C. Virus vectors used may actually cause disease and therefore medical technicians have removed those segments. D. RNA added via vectors to a human may cause a toxic response and so a buffer is added to the vector.