Explain the reasoning behind the laws in some European countries that limit the number of children that can result
from a single sperm donor. Do you agree with these restrictions? Why or why not? What will be an ideal response?
ANSWER: Answers will vary.
Background:Some
European countries have laws that limit how many children can be fathered by a single
donor, but in the United States, there is no limit. This has raised several concerns, including
the spread of genetic disorders and the chance of accidental inbreeding. Although most sperm
banks in the United States screen potential donors for potential for some common genetic
disorders, it is impossible to screen for all disorders.
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One secondary spermatocyte ultimately produces ____ mature sperm
a. 1 b. 2 c. 3 d. 4 e. 8
All of the following are examples of ex situ conservation except:a
breeding captive species in zoos. b. collecting eggs from nature. c. artificial insemination. d. breeding captive species and collecting eggs from nature. e. designating a large area as a national reserve.
The first amino acid added to a polypeptide is methionine but it will have internal methionines as well. Why are separate tRNAs for methionine used for translation initiation and elongation, and how are they distinguished by the ribosome?
What will be an ideal response?
A problem with the basic Oparin-Haldane model for the origin of life (though not necessarily an unsolvable one) is that ________
A) it does not explain the origin of chirality B) the early Earth is now not thought to have had a highly reducing atmosphere C) monomers have to be chemically activated before they will polymerize D) purine bases can attach to sugars in many equally probable ways E) All of the above.