(B) At the pet store you notice that zebrafish (Donio rerio) are sold in several
ID: 193261 • Letter: #
Question
(B) At the pet store you notice that zebrafish (Donio rerio) are sold in several varieties. You observe that Zebrafish have longfins or short fins, and you notice that there are dark-colored bodied and golden-colored bodied varieties. You purchase several of each variety and randomly allow them to breed You make the following observations: Mating 1: Longfin, Golden male x Longfin, Dark female Offspring105 Longfin, Straight Mating 2: Shortfin, dark male x Shortfin, Dark female 81 Shortfin, Dark 25 Shortfin, Golden 29 Longfin, Dark 10 Longfin, Golden Offspring: Mating 3: Shortfin, Dark male x Longfin, Golden female 51 Shortfin, Dark 48 Longfin, Dark Offspring: Mating 4: Longfin, Dark male x Shortfin, Golden female 38 Shortfin, Dark Offspring: 41 Shortfin, Golden a) Create a genetic nomenclature for these genes. (1 point) b) Which alleles are dominant & which alleles are recessive? (2 points) d) What are the most probable genotypes for the parents in each cross (4 points) Mating 1 Mating 2 Mating 3:Explanation / Answer
A- Short Fin as S and longfin as s.
Dark color as D and golden color as d.
B- In the second mating between the shortfin and dark male and shortfin and dark female we got the progenies in 9:3:3:1 ratio. This mating shows that the dark color is dominant over golden color and shortfin is dominant over longfin.
Dark color is dominant over golden color
Shortfin is dominant over the long fin.
C-
mating 1- ssdd male and ssDD female.
mating 2- SsDd male and SsDd female
mating 3- SsDD male and ssdd female
mating 4- ssDd male and SSdd female.
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