If a man expresses an X-linked recessive trait, his ____________________ was either homozygous or heterozygous
for the trait. Fill in the blank(s) with the appropriate word(s).
ANSWER: mother
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Homoplasies are useful characters for phylogenetic analyses
a. True b. False
Which tissues are correctly matched to their progenitor germ layer? (Check all that apply.)
_____ ectoderm—lining of the digestive tract _____ ectoderm—epidermis _____ endoderm—lining of the respiratory tract _____ endoderm—muscles _____ mesoderm—blood vessels _____ mesoderm—gonads
In a gene knock-in experiment, ________
A) the effect is exactly the same as a knockout B) the animal gene of interest is replaced with the human counterpart gene C) the gene is non-functional D) the embryo cannot survive to birth E) the gene product is produced to at least twice the normal levels
The variable region of the antibody is solely responsible the significant diversity of antigen targets
Indicate whether the statement is true or false