Use the phylogenetic tree below to answer the following question(s).
Which of the following statement is correct regarding the phylogenetic tree above?
A. The polar bear and the brown bear are the most recently evolved species.
B. The sun bear's closest relative is the sloth bear.
C. Most bears on the phylogenetic tree are extinct.
D. The American black bear has no closely related species.
Answer: A
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A stem cell is a cell that ____
a. can differentiate into specialized cell types b. has already differentiated c. can develop into two or three cell types d. can only develop into skin cells e. can only develop into bone cells
The portion of the DNA molecule that is not
translated and is a noncoding portion of DNA is composed of a. introns. b. anticodons. c. exons. d. transcriptons. e. exons and transcriptons.
Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid
The frogs are identical in appearance, but their mating calls, which females use to find mates, differ. Which difference most likely evolved first? A) polyploidy B) difference in mating calls C) Polyploidy and different mating calls must have evolved at the same time.
Consider an organism whose karyotype shows it to have a total of 60 chromosomes. How many chromosomes would be contained in the sperm of this organism?
A. 90 B. 46 C. 23 D. 30 E. 60