Genetics: Wild type mating?

Question

If a white eye, yellow body female was crossed with a wild type male, what would the genotypes and phenotypes of the offspring be? I'm not sure how to set up wild type alleles in crosses, or which genes are dominant in males vs. females.

Answer 1

eye color and the yellow body color are genes on the x-chromosome of fruit flies.

the red color (w+) is the dominant allele, and white color (w) is the recessive allele. The yellow body color (y) is a recessive allele and the brownish grey color (Y) is the diminant allele.



So if you have a white colored female with yellow body you already know the genotype: It must be

X(w/y) ;X(w/y)

--> the female fly must have both alleles of either recessive allele to display the white eyes and yellow body.



For the male you also know the gneotype. The Y chrnomosome doesnt carry the eye color or body color gene, so only whats on the X chromosome counts. the males are red eyed and brown colored so their X chromosome must have the w+ allele and the Y allele:

X(w+/Y).



With that information you can set up the Punnet square and simulate a cross:



_______male:X(w+/Y) ____Y



female

X(w/y)





X(w/y)





Now just fill out the boxes and you got your genotypes and phenotypes:



X(w/y);X(w+/Y) ---> red eyed brown bodied female

X(w/y);Y ---> white eyed yellow bodied male



all females will be red eyed and brown bodied since they get their X chromosome from the father.



all males will be white eyed and yellow bodied since they get their X chromosome from the mother

Answer 2

Sorry approximately this, that is gonna be an prolonged answer, and that i'm uncertain if i'm able to describe it incredibly with out drawing a punnets sq. diagram. perfect, If we initially call distinctive alleles so which you recognize what i'm speaking approximately: XC = X chromosome, everyday wings Xc = X chromosome, shrink wings Y = Y chromosome (because of the fact men have one X and one Y) F = no longer Fuzzy f = Fuzzy ok, initially: Genotype of the male = Xc,Y,F,F it has shrink wings, and a common physique, and is male. Genotype of the female = XC,XC,f,f it has everyday wings and a fuzzy physique Now, with those genotypes, the male can produce Xc,F and Y,F gametes in equivalent proportions, and the female produces all XC,f gametes. once you place those right into a 4x4 punnets sq. you get an F1 era all with the phenotype of standard wings and a common physique (the wild type), whether they might have interior of their genotype the recessive genes that their mom and dad carried, they might have the genotypes Xc,XC,F,f in the event that they're woman, and the genotype XC,Y,F,f if that is male, with equivalent proportions of woman and male. once you bypass the F1, your gonna ought to bypass woman and male (needless to say) so there will be male gametes XC,F XC,f Y,F and Y,f, and woman gametes Xc,F Xc,f XC,F and XC,f. those can then additionally be positioned right into a 4x4 punnets sq. and supply offspring with the genotypes Xc XC F F, Xc XC F f, XC XC F F, Xc XC f f, XC XC F f, XC XC f f, Xc Y F F, Xc Y F f, XC Y F f, XC Y f f, Xc Y f f and XC Y F F interior the ratios a million:3:a million:a million:a million:a million:a million:2:2:a million:a million:a million, giving the phenotypes of standard, shrink wings-everyday physique, everyday wings-Fuzzy physique and shrink wings-Fuzzy physique interior the ratios 9:3:2:2. desire that explains the thank you to get to the respond nicely sufficient, This incredibly isn't the least confusing thank you to describe genetic crosses like that. I apologise now that there is a few errors it my calculations, that is rather early right here, and that i grow to be making use of a distinctive notation whilst working it out, a super type of no longer have copied it onto right here properly. Edit: regarded at this whilst extra unsleeping, same as under, my working is stable, yet I believe him, 9:3:3:a million, yet please, leaf by this for your self, as he and that i've got the two reported, and accomplished, those products is easy to holiday up on

Answer 3

Go back and check the text or the problem set for more info. We don't even know what organism you are talking about. Drosophila probably. Somewhere they should provide which genes are dominant/ recessive/ autosomal/ x-linked.