In Drosophila melanogaster, the allele for red eyes is dominant over the allele for purple eyes, and the allele for a gray
body is dominant over the allele for a black body. A testcross was done to check for genetic linkage between the genes for
these traits. The results for the offspring are listed below:478
flies with red eyes and a gray body
27 flies with red eyes and a black body
462 flies with purple eyes and a black body
33 flies with purple eyes and a gray body
Which of the choices below best represents the map distance between the genes for these two traits?
a. 50.0 map units
b. 30.0 map units
c. 47.0 map units
d. 27.0 map units
e. 6.0 map units
ANSWER: e
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Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?
A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin B) nucleosome ? looped domains ? chromatin fiber ? heterochromatin C) heterochromatin ? nucleosome ? chromatin fiber ? looped domains D) chromatin fiber ? heterochromatin ? nucleosome ? looped domains E) chromatin fiber ? nucleosome ? looped domains ? heterochromatin
How did the researchers in Investigating Life 22.5 conduct their experiment studying "ant plants"?
A. They picked other insects off of some leaves. B. They removed the nectar from some leaves. C. They used drops of glue to exclude tramp ants from some leaves. D. They sprayed some leaves with insecticide. E. They picked the tramp ants off of some leaves.
Erasmus Darwin, Charles Darwin's grandfather, suggested the possibility of evolutionary descent in his writings.
Answer the following statement true (T) or false (F)
What is the first level of control of eukaryotic gene transcription?
A) RNA splicing B) attachment of RNA polymerase to the promoter C) DNA packing and unpacking D) the binding and unbinding of transcription factors to enhancer sequences