FIVE. You have identified a new mutant in Drosophila that defines a gene you call “red.” When mutant it causes the “neck” of the fly (cervical connective) to be red. It behaves as an autosomal recessi...
FIVE. You have identified a new mutant in Drosophila that
defines a gene you call “red.” When mutant
it causes the “neck” of the fly (cervical connective) to be red. It
behaves as an autosomal recessive
mutation with alleles red+ and red-.
You suspect it is linked to two known genes on the second
chromosome “re” and “ti”. The re-
mutation behaves as an autosomal recessive. Homozygous mutant flies
fixate on TV reruns, “re+”
normal flies avoid TV. The “ti” gene is linked to the “re” gene and
also behaves as an autosomal
recessive. Homozygous mutant flies are attracted to ti leaves,
“ti+” flies are not.
You crossed homozygous “red-“ flies to “re- ti-“ flies. The F1 are
all normal in phenotype; F1 flies are
then crossed to the triply homozygous mutant “red- re- ti-“ stock.
The following F2 are recovered (the
“red” gene is assumed to be in the middle of the linkage group,
that may not be true).
Phenotype Number
“re+ red- ti+” 4735
“re- red+ ti-“ 4716
“re+ red+ ti-“ 254
“re- red- ti+” 245
“re+ red+ ti+” 25
“re- red- ti-“ 24
“re- red+ ti+ 1
(Note, only 7 classes were recovered). Does your new gene form a
linkage group with the known
genes? If so, provide the map with map distances. Is there any
interference? If so, how much?
Homework Answers
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FIVE. You have identified a new mutant in Drosophila that defines a gene you call “red.” When mutant it causes the “neck” of the fly (cervical connective) to be red. It behaves as an autosomal recessi...
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please help me!!!
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Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver, qu, and determines that it is due to an autosomal recessive gene. She wants to determine whether the gene encoding quiver is linked to the recessive gene for vestigial wings, vg. She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits, and then uses the resulting F1 females...
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please help me!!!
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