The teeth designated by the letter “D” in the above
figure are called
a. canines.
b. premolars.
c. incisors.
d. molars.
e. none of these.
Answer: c
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If one of Mendel's genes had three alleles that differentially affected the phenotype rather than two, what would he have observed among the progeny of many crosses between all pairs of the three pure-breeding lines in the F1 and F2 generations?
Comments: This case brings up the chance of codominance or incomplete dominance and provides for multiple phenotypes among a large set of crosses. In any one cross, there would be specific pure-breeding strains used, but there could be white, pink, and red flowers that are all pure breeding that may have complete or incomplete dominance. The population effects of this kind of genetics could move toward a broader range of phenotypes leading to the idea of blending inheritance. Mendel's innovative idea was to narrow the traits to simple binary phenotypes. This complication could show what could happen if he had not been so thoughtful. A. In each of the crosses, two phenotypes in the F1 generation. B. Only a single phenotype would be observed in the F1 generation because only one allele can be dominant. C. No evidence would exist for the law of segregation. D. No pure breeding plants produced in the F2. E. None of the responses are correct.
How can replication be increased in the Artemia bioassay to improve reliability of results?
What will be an ideal response?
In eukaryotes many genes may be affected by a steroid hormone because they are clustered in operons
1.True 2.False
Which of the following characteristics is(are) a basic property of cells?
A) cells posses a genetic program and the means to use it. B) Cells are capable of producing more of themselves C) cells are highly complex and organized D) cells acquire and utilize energy E) all of the choices are correct