Why is the absence of bone in Chondrichthyes considered a derived trait?
What will be an ideal response?
ANSWER: All the fishes that lived before the appearance of Chondrichthyes had either bony armor or
a bony endoskeleton. Therefore, it is concluded that the trait was lost in the evolution of
the lineage.
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Understanding the signals that activate pancreatic stem cells to differentiate as beta cells could be used to treat
A) restless legs syndrome. B) male infertility. C) endometriosis. D) diabetes mellitus.
Individuals who are heterozygous for sicklecell
anemia have a greater resistance to
a. malaria. b. diphtheria. c. cholera. d. typhoid fever. e. all of these
In some fruit flies, an inversion involving the white-eyed locus (w) moves the w+gene from one end of the X chromosome to a location nearer to the centromere. Flies with a w+ or w+/w genotype are normally expected to have red eyes
However, in flies with the inversion, the eyes are mottled red and white. Explain why.
The processes of transcription and translation are collectively known as
A. gene duplication. B. RNA processing. C. protein synthesis. D. gene expression. E. DNA synthesis.