If two individuals who are heterozygous for the sickle-cell disease mate, their offspring:
a) will all have the sickle-cell disease.
b) will have a 25% chance of having sickle-cell disease.
c) will have a one-quarter chance of being a sickle-cell free homozygote.
d) will consist of males who all have sickle-cell disease and females who all are heterozygous for sickle-cell disease.
e) both b) and c) are correct.
Ans: e) both b) and c) are correct.
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a. True b. False
In the following pedigree, the indicated trait is caused by what type of allele?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked
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How successful is the technique of cloning adult mammals by implanting DNA into donor eggs?
a. Few embryos survive until birth, and of those that do, many have serious health problems. b. About half of the embryos survive until birth, but many of these die before adulthood. c. Of the embryos that survive until birth, health outcomes are predictable. d. Most embryos survive, but are not able to reproduce as adults. e. Most embryos survive and lead healthy adult lives.