A group is considered paraphyletic if
A. not all descendants of the common ancestor are included.
B. the group does not contain the most recent common ancestor.
C. the common ancestor of the group is not included in the group.
D. all members of the group share a common ancestor.
E. it is the most parsimonious grouping.
Answer: A
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Many children born with ornithine transcarbamylase deficiency (OTC) die within seventy-two hours of birth. Jesse Gelsinger was not diagnosed with OTC until he was two because ________ and therefore his symptoms were milder.
A) his defective gene was autosomal recessive B) he was a mosaic C) of X-inactivation in males D) of parental imprinting
A scientist crosses two homozygous plants—one with white flowers and one with red flowers. Which of the following characteristics of their offspring indicates incomplete dominance?
a. all pink flowers b. a mix of red and white flowers c. all white flowers d. all red flowers
Large polymers are formed from smaller subunits
by what type of reaction?
a. oxidation b. reduction c. condensation d. hydrolysis e. decarboxylation
What ability is found in stem cells that are totipotent?
A) Totipotent cells can only develop into blood cells. B) Totipotent cells can develop into any cell type. C) Totipotent cells can transform skin into muscle cells. D) Totipotent cells can change the genetic code of an organism.