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Genetics Vocabulary › ViewWhat is an allele that is masked in the phenotype by the presence of a dominant allele called?
A. recessive
B. genetics
C. homozygous
D. dominant
Blood & Blood Vessels › View
Which statement about veins is correct?
A. They all carry deoxygenated blood
B. .They carry blood away from the heart.
C. They have thick muscular walls.
D. They have valves to prevent backflow.