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If you scored 28 females and 22 males...
TABLE 1: If you scored 28 females and 22 males, populate the table below in the...
TABLE 1: If you scored 28 females and 22 males, populate the table below in the appropriate phenotype area. Go ahead and leave the date column blank. Phenotype of F1 Progeny Date(s) Scored No. of Males No. of Females Total light brown, unforked, crossveins _________ _________ 0 28 28 yellow, forked, crossveinless _________ _________ 22 0 22 other (if any) _________ _________ Total 22 28 50 Conclusions from F1 results: If...
Obj. 37. In Drosophila forked (F) bristles is X-linked and dominant. If a virgin female homozygous...
Obj. 37. In Drosophila forked (F) bristles is X-linked and dominant. If a virgin female homozygous for forked s crossed with a wild-type male predict; the proportions/ratios of genotypes and phenotypes among the F1 and F2 as the sex and bristle trait. F: Females Phenotype F1 Males Phenotype Genotype Genotype F2 Females Phenotype = F2 Males Phenotype Genotype = Genotype =
1. You cross true breeding yellow crossveinless forked (y, cv, and fare autosomal genes) female flies...
1. You cross true breeding yellow crossveinless forked (y, cv, and fare autosomal genes) female flies (y-y-cv-cv- f-f- XX) to wild type male flies (y+y+ cv+cV+ f+f+ XY). a. What are the genotype(s) of the F1 progeny? b. How many different combinations of those four traits are possible? c. Assuming simple Mendelian recombination, if we do a test cross with the female F1, what fraction of the F2s will have the phenotype: i. yellow crossveinless forked male? ii. wild type...
We crossed pure-bred female flies with yellow body and forked-shaped bristles with male flies extra bristles....
We crossed pure-bred female flies with yellow body and
forked-shaped bristles with male flies extra bristles. The
subsequent F1 flies showed all normal phenotypes except that all of
the F1 males are yellow-body. We crossed again the normal F1
females with males homozygous for yellow body, extra bristles, and
forked bristles as a testcross. The number of each category of F2
progeny is shown below. The mutant allele for yellow body is y; the
mutant allele for extra bristles is...
In Drosophila, the autosomal recessive brown eye color mutation (b) displays interactions with both the X-linked...
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
You begin working in a genetics lab that uses Drosophila and find that a previous student...
You begin working in a genetics lab that uses Drosophila and
find that a previous student has left behind a bottle of flies that
have a yellow (instead of brown) body with no information about the
mutation that leads to the yellow body color. You first determine
that these flies are true breeding, and then set up some crosses.
Cross 1: You cross yellow females with true breeding wild type
males. In the F1s, all of the females have brown...
A mutation in the Drosophila bristle gene (fb) (which is X-chromosome linked) causes a recessive forked...
A mutation in the Drosophila bristle gene (fb) (which is X-chromosome linked) causes a recessive forked bristle phenotype (rather than the normal type of bristle). Another mutation in Drosophila autosomal body color gene (BR) causes a recessive brown color body (rather than the normal black body). A geneticist carried out the following cross: X+ / Y ; BR/br x X+/ Xfb ; BR/br If total of 240 F1 progeny were obtained, the “expected” numbers are: normal bristle male progeny -...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive mutant allele that independently assorts with an autosomal recessive mutant allele for hairy (h) body. A parental cross was made between a fly that is homozygous for normal wings with a hairy body and a fly with vestigial wings that is homozygous for normal body hair. The wild-type F1 flies were crossed to each other and produced 1536 offspring. The phenotypes of the F2...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive...
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by an autosomal recessive mutant allele that independently assorts with an autosomal recessive mutant allele for hairy (h) body. A parental cross was made between a fly that is homozygous for normal wings with a hairy body and a fly with vestigial wings that is homozygous for normal body hair. The wild-type F1 flies were crossed to each other and produced 1536 offspring. The phenotypes of the F2...
3. Initial cross: Now become familiar with the phenotype of Cy/Pm D/Sh fties and with the...
3. Initial cross: Now become familiar with the phenotype of Cy/Pm D/Sh fties and with the phenot of the mutant stock of flies your instructor has chosen for you to identify as to linkage group To locate the selected mutant gene in its linkage group or chromosome, roceed as follows: Select virgin females homozygous for the mutant gene arbitrarily designate the allele as m) that you are to locate. Mate such virgin mutant females to Cy/Pm D/Sb males. 4. What...
Obj. 37. In Drosophila forked (F) bristles is X-linked and dominant. If a virgin female homozygous for forked s crossed with a wild-type male predict; the proportions/ratios of genotypes and phenotypes among the F1 and F2 as the sex and bristle trait. F: Females Phenotype F1 Males Phenotype Genotype Genotype F2 Females Phenotype = F2 Males Phenotype Genotype = Genotype =
1. You cross true breeding yellow crossveinless forked (y, cv, and fare autosomal genes) female flies (y-y-cv-cv- f-f- XX) to wild type male flies (y+y+ cv+cV+ f+f+ XY). a. What are the genotype(s) of the F1 progeny? b. How many different combinations of those four traits are possible? c. Assuming simple Mendelian recombination, if we do a test cross with the female F1, what fraction of the F2s will have the phenotype: i. yellow crossveinless forked male? ii. wild type...
We crossed pure-bred female flies with yellow body and
forked-shaped bristles with male flies extra bristles. The
subsequent F1 flies showed all normal phenotypes except that all of
the F1 males are yellow-body. We crossed again the normal F1
females with males homozygous for yellow body, extra bristles, and
forked bristles as a testcross. The number of each category of F2
progeny is shown below. The mutant allele for yellow body is y; the
mutant allele for extra bristles is...
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
You begin working in a genetics lab that uses Drosophila and
find that a previous student has left behind a bottle of flies that
have a yellow (instead of brown) body with no information about the
mutation that leads to the yellow body color. You first determine
that these flies are true breeding, and then set up some crosses.
Cross 1: You cross yellow females with true breeding wild type
males. In the F1s, all of the females have brown...
3. Initial cross: Now become familiar with the phenotype of Cy/Pm D/Sh fties and with the phenot of the mutant stock of flies your instructor has chosen for you to identify as to linkage group To locate the selected mutant gene in its linkage group or chromosome, roceed as follows: Select virgin females homozygous for the mutant gene arbitrarily designate the allele as m) that you are to locate. Mate such virgin mutant females to Cy/Pm D/Sb males. 4. What...
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