Which of these melanomas displays rapid and invasive growth, and can be fatal if not removed at an early stage of development?
1.1 only
2.2 only
3.3 only
4.both 2 and 3
5.all of the choices
3
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When analyzing octads (ordered tetrads), second-division (MII) segregations result from
A) single crossovers between linked genes. B) double crossovers between linked genes. C) single crossovers between a gene and a centromere. D) independent assortment of unlinked genes. E) nondisjunction of homologs.
A transmembrane protein differs from other membrane proteins because it:
a. is covalently linked to the outer surface of the plasma membrane. b. is a glycoprotein with carbohydrates attached. c. is attached to the inside of the membrane by an ionic bond. d. completely extends through the membrane. e. is completely embedded within the membrane
According to the modern theories on how life formed on Earth, prokaryotes are thought to have evolved before eukaryotes. Provide evidence to support that pattern of evolution based on the composition of the early Earth's atmosphere
What will be an ideal response?
Carriers of cystic fibrosis have some protection against intestinal infections such as cholera. However, people with two copies of the cystic fibrosis allele develop a life-threatening disease. The mutant allele is very common in people of northern European descent because of
A. disruptive selection. B. directional selection. C. artificial selection. D. sexual selection. E. stabilizing selection.