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A line of Drosophila melanogaster with ebony body and sepia eyes (line A) is crossed to a line with tan body and red eyes (line B). The F1 are all tan-bodied, redeyed.
a) (one point) What proportion of gametes produced by the F1 have the dominant allele for both loci? What proportion of the gametes produced by line B have the dominant allele for both loci?
Next, imagine that An F1 female is crossed to a male from line A.
If 1000 offspring were scored for both characters, what number of offspring would be expected to have each of the four phenotypes (assuming no linkage)? List them below.
Now imagine that the following data were actually collected from the cross above:Body EyesTan normal 491Tan sepia 9Ebony normal 8Ebony sepia 492
b) (one point) Are the loci linked? If so, how many map units are they apart ? Do a ?2 test and show your work below. Diagram this cross.
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If A/A x B/B is crossed with a/a and the F1 is testcrossed, what is the genotype and percenage of every progeny if the two genes are unlinked;
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Many scientists were reluctant to accept the results of Avery, MacLeod, and McCarty's experiments showing that DNA (rather than protein) was the transforming principle. Why?
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Suppose i f an individual with genotype pQ/Pq heterozygous for both loci in trans arrangement of alleles is crossed with an individual of genotype PQ/pq.
PKU disease is autosomal recessive. Two carriers for PKU disease marry. What are the probabilities of the phenotypes and genotypes of their offspring?
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