If a man expresses an X-linked recessive trait, ____

a. all of his brothers will also express it
b. his father transmitted the trait to him
c. his father carried the trait
d. all of his sisters will also express it

e. his mother was heterozygous or homozygous for the trait


e

Biology & Microbiology

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What kingdoms composed the three kingdom classification system used by scientists in the late 1800s?

a. animals, plants, fungi b. animals, plants, bacteria c. animals, fungi, protists d. animals, plants, protists

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Particularly with regard to gas exchange, why do we have respiratory and cardiovascular systems, but flatworms, which are only a few cells thick, don't?

What will be an ideal response?

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