Question

Using the Fly Breeder tool in the Fly Biolab, we analyze the heritability of eight other traits. Based on the phenotype ratios observed, explain whether each trait is caused by a dominant or recessive allele, and whether the trait is autosomal or sex-linked. Support each conclusion by referring to a completed Punnett Square.

Trait 1: Purple Eyes

Parent Phenotypes: Male- Red Eye Female- Purple Eye

F1 Results (phenotype ratios): 100% red eyes

F2 Results (phenotype ratios): 75% red: 25% purple

Conclusion (Incl. Punnett Squares): ???

Trait 2: No Eyes

Parent Phenotypes: Male- Normal Female- No Eyes

F1 Results (phenotype ratios): 100% with eyes

F2 Results (phenotype ratios): 75% normal eyes: 25% no eyes

Conclusion (Incl. Punnett Squares): ???

Trait 1: Star Eyes

Parent Phenotypes: Male- Normal Female- Star Eyes

F1 Results (phenotype ratios): 100% star eyes

F2 Results (phenotype ratios): 75% star eyes: 25% normal

Conclusion (Incl. Punnett Squares): ???

Trait 1: Ebony Body

Parent Phenotypes: Male- Normal Female- Ebony

F1 Results (phenotype ratios): 100% normal

F2 Results (phenotype ratios): 75% normal: 25% ebony

Conclusion (Incl. Punnett Squares): ???

Trait 1: Yellow Body

Parent Phenotypes: Male- Normal Female- Yellow

F1 Results (phenotype ratios): -All Male Yellow -All Female Normal

F2 Results (phenotype ratios): 50:50

Conclusion (Incl. Punnett Squares): ???

***Need Punnett Squares***

Answer 1

Trait- Purple Eyes for Purple r- R. for red Parent geveran' on Red eye (RR) * Purple eye (7) Rr (Red eye) 100%. ft generanon. te generation. % Rr RRRR [Rr m Red is dominant over the furple. This trait should be autosomal at which is proved by the funnet square. Trait-2 No Eyes. o Normal) Phenotypes. 3 Red & 1 Purple 3x100 = 754 Red. 1/ P.x100 = 25% Purple f (No Eyes) ee ЕЕ fi generahon. fa generation. Ee E e ELEE e 7 Phenotypes. 3 Normal eye & I e Ee. ee. I No eye So 75%. Normalt 251. No eyes. Conclusion No eyes itralt would be a autosomal recessive trait. Normal eye ailele (0) the no eye (e). No criss cross pattern is found.

anchester - Trait-3 star eyes islar eye) P. Phenotypes I (Normal) SS SS 1 f generation. fa generation. Ss o (stor eye) Ss X (star eye 100%.). & (star eye). Ss. es s ss, Ss..Ss . s star eye 3/X160 e 75% ss Normal eye 5S /ekla! Conclusion :- Stas eye allele would be dominant over' nomal eye. As found in punnet square. 75% of fly once have star eye and 25% have noomal eye. So this trait should be autosomal dominant. Trait 4. Ebony body. farent phenotypes. of (normal) f ( Ebony). EF ee. F giverahon. Ee. (100% normal). Normal) 9 (Normal) Ee X te. 19 generabon o E EC Ee. e. EE, Ee, Ee Norma 3/4x100 - 25%. Nogme ee a 1/4 X 100 - 25%. Ebat e te ee. Conclusion this trait is Ebony allele allele is a recessive allele, and Drony plete resine ausomal recessive.

MALE. it. 5- Yellow Body. Parent Phenotypes or Normal OXY X o Penale . fi generation 0% x x all xx xy y xy Xy female a Normal all male a yellow. fa generation » x x x x (Yellow) (Normal) Pio X X XX (Yellow) xy remale. XXX = Normal Yellow xxx - Normal. XY. L(byellow) (Normal) 50% females are Yellow Male z X'y & Yellow x y z Normal. sor. Males are yellow. Phenotype raho so% females & males are yellow . sor. females & males are normal. Tano - (9.2 or so: 50 ) criss to Conclusions 1 trait would be sex linked recessive trait. ellele is recensire and linked to x chromosome. Hellche body alleles en mus show Criss UDSS pallem, means I from female to male as found in in generation temale having yellow Yellow body all haustened to male in F1 generation. millow allele always show transfered from female Sex they linked are