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

Biology & Microbiology

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Homoplasies are useful characters for phylogenetic analyses

a. True b. False

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The variable region of the antibody is solely responsible the significant diversity of antigen targets

Indicate whether the statement is true or false

Biology & Microbiology