(7 points) You are mapping the genome of a new species of fish. You have isolate

Question

(7 points) You are mapping the genome of a new species of fish. You have isolated lines that breed true for having either stripes and long or spots and short fins. Crossing these lines yields progeny with stripes and long fins. Crossing Fi progeny with fish that have spots and short fins yield the following progeny: stripes, long fins spots, short fins stripes, short fins spots, long fins 9 total 143 a. Which skin pattern and fin length alleles are dominant? b. Do the skin pattern locus and fin length locus appear to be linked? How can you tell? c. If the genes are linked, calculate the recombination frequency between them.

Explanation / Answer

parents........SSLL (stripes and long fins) x ssll (spots and short fins)...........SsLl F1 progeny................stripes and long fins.......SsLl F1 crossed to......spots and short fins.............ssll gametes from parental lines..............Sl, sL gametes from crossing over in F1...............SL, sl SL Sl sL sl SL SSLL (stripes and long fins) SSLl (stripes and long fins) SsLL (stripes and long fins) SsLl (stripes and long fins) Sl SSLl (stripes and long fins) SSll (stripes and short fins) SsLl (stripes and long fins) Ssll (stripes and short fins) sL SsLL (stripes and long fins) SsLl (stripes and long fins) ssLL (spots and long fins) ssLl (spots and long fins) sl SsLl (stripes and long fins) Ssll (stripes and short fins) ssLl (spots and long fins) ssll (spots and short fins) Stripes and long fins is dominant. Spots and short fins is recessive. recombinant gamete frequency...............7+9/143x100= 11.18% map unit distance between Ss and Ll is ..............11.18% or 11.18 map units very less recombination percentage shows that alleles are linked and are located on the same chromosome. The above analysis is an example for two-point test crossing.

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.