How does a geneticist use pedigrees?

Which combination of sex chromosomes results in a male human being?

Which of the following statements is part of the cell theory?

Mendel called plants that received different alleles for a trait from each parent ____.

Which pair of structures can be found ONLY in plant cells?

A paleontologist discovers a fossil within a layer of rock. The paleontologist can probably conclude ____.

Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?

Fossils of some intermediate forms have not been found because

On a pedigree, a half-shaded circle represents a(n)

___________ is the control center of the cell; directs cell activities.

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