HomeworkLib
Question

In drosophila the genes y,f and v are all linked.females who are homozygous for the recessive...

In drosophila the genes y,f and v are all linked.females who are homozygous for the recessive alleles of all three genes y fav/yes ae crossed to wild type males. the resulting trihybrids f1 females are test-crossed The f2 are distributed

science   biology   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Answer:

If the genes are incompletely linked, 8 phenotypes are produced as below:

y+ f+ v+ / y+ f+ v+ (wild) X y f v / y f v (recessive alleles of all three genes)---Parents

y+ f+ v+ / y f v ---F1

y+ f+ v+ / y f v (F1) X (Tester) y f v / y f v----Testcross

F2:

y f v

y+ f+ v+

y+ f+ v+ / y f v

y+ f+ v

y+ f+ v / y f v

y+ f v+

y+ f v+ / y f v

y+ f v

y+ f v / y f v

y f+ v+

y f+ v+ / y f v

y f+ v

y f+ v / y f v

y f v+

y f v+ / y f v

y f v

y f v / y f v

If the three genes are completely linked, only two types of phenotypes of produced as below:

F2:

y f v

y+ f+ v+

y+ f+ v+ / y f v

y f v

y f v / y f v

0 0
Add a comment
Know the answer?
Add Answer to:
In drosophila the genes y,f and v are all linked.females who are homozygous for the recessive...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Please answer this carefully Xd In Drosophila, the genes y, f, and vare all X-linked. Females...

    Please answer this carefully Xd In Drosophila, the genes y, f, and vare all X-linked. Females who are homozygous for recessive alleles of all three genes (y fv/y fv) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. Answer questions a, b and c. The F2 are distributed as follows: vfv3210 ly fyt 1024 678 690 1044 601 V + + 3222 10,000 (3)_ _and__ (4)_ a. The F2 progeny that have the parental genotypes are: _(1)__and__(2)...

  • 4. In Drosophila, the genes y, f, and v are all X-linked. y fv females are crossed to wild-type m...

    please help with parts a-g 4. In Drosophila, the genes y, f, and v are all X-linked. y fv females are crossed to wild-type males and the F, females are test-crossed. The F2 males are distributed as follows: Phenotype Number 3210 72 1024 678 690 1044 60 3222 10,000 Give the genotype of the F1 females that gave rise to these progeny to show linkage phase? (2 points) A. 8. Which phenotypic classes are the parental types? (2 points) C....

  • In Drosophila melanogaster, the recessive X-linked alleles white (w), miniature (m) and forked (f) give the...

    In Drosophila melanogaster, the recessive X-linked alleles white (w), miniature (m) and forked (f) give the phenotypes white eyes, miniature wings and forked brushes. The recombination between the w and m loci is 35%, and between the m and f loci, 20%. Wild-type males were crossed with females from a strain that was homozygous recessive for the three alleles, then the F1 flies were sibling mated. What phenotype frequencies are expected in F2 a) if there is no interference, and...

  • Cinnabar eyes (cn) and reduced bristles (rd) are autosomal recessive characters in Drosophila. A homozygous wild-type...

    Cinnabar eyes (cn) and reduced bristles (rd) are autosomal recessive characters in Drosophila. A homozygous wild-type female was crossed to a reduced, cinnabar male, and the F1 males were then crossed to the F1 females to obtain the F2. Of the 400 F2 offspring obtained, 292 were wild type, 9 were cinnabar, 7 were reduced, and 92 were reduced and cinnabar.

  • Can someone please help me answer this question, and teach me how to do it step...

    Can someone please help me answer this question, and teach me how to do it step by step? I am currently taking genetics and am extremely confused. In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males (y+ f+ v+ /y+ f+ v+ ). The resulting trihybrid F1 females are test-crossed. The F2 are distributed as...

  • 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 =

  • 4. There are three genes on the X-chromosome in drosophila, yellow (y), white (w), and cut...

    4. There are three genes on the X-chromosome in drosophila, yellow (y), white (w), and cut (ct). A yellow-bodied, white-eyed, and a homozygous normal winged female fly was crossed to a male with wild type body, wild type eyes, and cut wings. The Fi females were wild type for all three traits, while the Fi males had yellow bodies, white eyes, normal wings. The Fi females were crossed to yellow bodied, white eyed, cut wing males. The resulting F2 progeny...

  • In Drosophila, genes a and b are located at positions 22.0 and 42.0 on chromosome 2, and genes c ...

    Explain how the positioning is used to calculate proportion. In Drosophila, genes a and b are located at positions 22.0 and 42.0 on chromosome 2, and genes c and d are located at positions 10.0 and 25.0 on chromosome 3 A fly homozygous for the wild-type alleles of these four genes was crossed with a fly homozygous for the reces- sive alleles, and the F, daughters were backcrossed to their quadruply recessive fathers. What offspring would you expect from this...

  • Finally, bow-legs is hypothesized to be X-linked recessive in Drosophila melanogaster. The P1 virgin females were,...

    Finally, bow-legs is hypothesized to be X-linked recessive in Drosophila melanogaster. The P1 virgin females were, once again, homozygous wild type but the males were bow-legged. There were 52 wild type males and 67 wild type females in the F1 generation. The F2 generation contained 30 wild type males, 75 wild type females, 40 bow-legged males and no bow-legged females. Does this data support or reject the hypothesis? Use chi square to prove your position.

  • Question 5 In Drosophila, ebony body (e) and rough eyes (r) are encoded by linked autosomal...

    Question 5 In Drosophila, ebony body (e) and rough eyes (r) are encoded by linked autosomal recessive genes on the third chromosome and are completely linked at O map units apart. A homozygous ebony female was crossed to a homozygous rough male. The F1 were all wild ty The F1 females were crossed to ebony, rough males. Give the phenotypes and their proportions in the F2. ebony, rough 20%, wildtype 20%, ebony 30%, rough 30% ebony, rough 30%, wildtype 30%,...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT