Most people with the dominant mutant polydactyly allele have extra digits, but at least 25% have the normal number of digits. What is the genetic explanation for this observation?
A) dominant negative allele
B) temperature-sensitive allele
C) lethal allele
D) partial dominance
E) incomplete penetrance
E
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Where do the light-dependent reactions take place?
a. stroma b. intermembrane space c. thylakoid membrane d. thylakoid lumen
Which of the following is consistent with the out-of-Africa hypothesis?
A) Modern Homo sapiens can trace their origin back to Neanderthals. B) Modern Homo sapiens can trace their origin back to Homo erectus. C) Interbreeding between early hominin species in Europe and Asia lead to the distinctive features of modern Homo sapiens. D) Homo sapiens have a common ancestor with Neanderthal and Homo erectus from Africa but did not interbreed with them. E) Modern Homo sapiens and Neanderthals have no common ancestor more recent than the first mammals.
Referring to the image above, what is the most likely sequence of DNA that codes for the amino acid sequence is asn-tyrphe-
ser-pro?
a. AACTATAAATCACCA b. GGGCCATGTAAACTA c. CUUAUAAAAAGUUGA d. TTGATAAAAAGTGGT e. TTGATCGGAAGTTGA
To apply parsimony to constructing a phylogenetic tree, _____
A) choose the tree that assumes all evolutionary changes are equally probable B) choose the tree in which the branch points are based on as many shared derived characters as possible C) choose the tree that represents the fewest evolutionary changes, either in DNA sequences or morphology D) choose the tree with the fewest branch points