Why are skin grafts between identical twins more successful than grafts between more unrelated individuals?
a. Identical twins share the same uterine environment.
b. Identical twins are exactly matched in age.
c. Identical twins have identical HLA alleles.
d. Identical twins are always the same sex.
e. Identical twins have the same blood type.
c
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In some societies, the birth of a deformed child is regarded as a sign of impending war or famine
a. True b. False Indicate whether the statement is true or false
One of the following does not occur in RNA
A. Adenin B. Guanin C. Uracyl D. Thymine E. Cytosin
Clones of B or T cells are:
a. being produced continually b. interchangeable c. produced only when their surface receptors recognize a specific antigen d. involved in innate immunity e. produced and mature in the bone marrow
You catalog all obligate asexual species within a family of insects and notice that asexual species are rare and are all members of genera that consist mainly of sexual species. Why do you conclude that asexual species tend to be short lived?
What will be an ideal response?