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A female Drosophila supposedly heterozygous for two recessive mutations cn and lz that are on the same arm of the X chromosome (cn lz/+ +) surprisingly expresses both these genes. The male progeny of the female will be
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12 years
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Biology
by
anonymous
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In Drosophila, the two genes w and sn are X-linked and 25 map units apart. A female fly of genotype w+ sn+/w sn is crossed to a male from a wild-type line. What percentage of male progeny will be w+ sn?
asked
12 years
ago
in
Biology
by
anonymous
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In maize, two plants that are both heterozygous for the recessive alleles a and b are crossed. What frequency of double-mutant progeny will appear if a and b are 7.2 map units apart and both parents carry a and b in trans?
asked
12 years
ago
in
Biology
by
anonymous
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In Drosophila the recessive alleles for brown and scarlet eyes (resulting from two independent genes) interact so that the double homozygous recessive is white. A pure-breeding brown and pure breeding scarlet are crossed. What proportion of the F2 will be white?
asked
12 years
ago
in
Biology
by
anonymous
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What genotype is present most often among the progeny (F2) of a dihybrid cross (AaBb X AaBb)?
asked
7 years
ago
in
Biology
by
anonymous
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The Drosophila genes for white eyes (w), tan body (t) and vestigial wings (vg) lie at map positions 2, 22, and 52 respectively. Out of 500 progeny, 21 exhibited double crossovers. What is the degree of interference?
asked
12 years
ago
in
Biology
by
anonymous