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, with the following results for the offspring:478
flies with red eyes and a black body
27 flies with red eyes and a gray body
462 flies with purple eyes and a gray body
33 flies with purple eyes and a black 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
E
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Ernst Mayr defined a biological species as a
A. population, whose members can interbreed. B. group of closely related organisms. C. All of the answer choices are correct. D. group of organisms that live in the same ecosystem, that can interbreed and produce offspring. E. population or group of populations that can interbreed and produce fertile offspring.
There are how many different kinds of RNA
nucleotides? a. 3 b. 4 c. 5 d. 6 e. 12
In which of the following does the onset of symptoms usually occur in individuals after childbearing
age? a. Tay-Sachs b. hemophilia c. Huntington's d. muscular dystrophy e. achondroplasia
Describe the relationship between introns (size and number) and organismic complexity in eukaryotes
What will be an ideal response?