Monozygotic twins:a
occur when two eggs are ovulated.
b. may be of different sexes.
c. have different sets of genes.
d. are called identical twins.
e. result from the fertilization of two sperm cells.
d
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The transplant of pig bone marrow into a human recipient may overcome the ____________________ triggered by transplanted pig organs
Fill in the blank(s) with correct word
Streptobacillus moniliformis is unusual in that it
A. forms spores. B. spontaneously forms L-forms. C. is anaerobic. D. has a cell wall
The pseudoautosomal regions of the Y chromosome correspond to
A) male-specific regions of the Y chromosome. B) female-specific regions of the Y chromosome. C) counterparts on the X chromosome with which they can cross over. D) places on the interior of the nuclear membrane where the Y chromosome attaches during cell division.
During development, an XX female embryo will form one of the X chromosomes in each cell into a Barr body. This usually occurs
A) about two weeks after zygote formation. B) by the end of the first trimester. C) at the 16-cell stage. D) in the X that has the most recessive alleles.