When you look at a phylogenetic tree of reptile classes, turtles, lizards and snake, and crocodiles are grouped together and birds are set off to the side but with a common ancestor for both groups. This would
A. be a monophyletic tree.
B. be a paraphyletic tree.
C. be a polyphyletic tree.
D. have the taxonomy wrong because birds should be included with the others to make it a monophyletic tree.
E. be a paraphyletic tree but the taxonomy wrong, because birds should be included with the others to make it a monophyletic tree.
E. be a paraphyletic tree but the taxonomy wrong, because birds should be included with the others to make it a monophyletic tree.
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In sickle cell anemia, the defective hemoglobin differs from the normal hemoglobin by
A. the color of the pigment. B. the size of the molecule. C. a single amino acid substitution. D. the total number of amino acids. E. the type of blood cell it is found in.
The type of biome characteristic of an area depends mainly on rainfall and temperature. Which biome gets the most rainfall?
1.forests 2.grassland 3.shrubland 4.tundra
Which of the following white blood cells are equipped with receptors for specific antigens?
a. neutrophils b. basophils c. eosinophils d. dendritic cells e. B and T lymphocytes
In some butterfly populations, there are equal frequencies of alleles that code for black and yellow coloration. This is an example of
A) stabilizing selection. B) sexual selection. C) nonrandom mutations. D) directional selection. E) balanced polymorphism.