question archive WwXxYyzz x wwXXYyZz A mating between two individuals is represented above
WwXxYyzz x wwXXYyZz A mating between two individuals is represented above
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WwXxYyzz x wwXXYyZz A mating between two individuals is represented above. What is the probability of this mating producing the genotype below? WwXXyyzz 7/265 1/32 7/32 27/64 1/64
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The tetrahybrid cross can be done on these 4 genes by taking into consideration that they are undergoing independent assrtment (the alleles of two or more different genes always assort independently of each other).
Cross
WwXxYyzz x wwXXYyZz
Genotype whose ratio has to be determined WwXXyyzz
Gene 1
Genotype Ww x ww
| w | w | |
| W | Ww | Ww |
| w | ww | ww |
Ww=2/4
Gene 2
Genotype Xx x XX
| X | X | |
| X | XX | XX |
| x | Xx | Xx |
XX=2/4
Gene 3
Genotype Yy x Yy
| Y | y | |
| Y | YY | Yy |
| y | Yy | yy |
yy=1/4
Gene 4
Genotype zz x Zz
| Z | z | |
| z | Zz | zz |
| z | Zz | zz |
zz=2/4
Ratio of WwXXyyzz
Genes Ww-2/4
XX-2/4
yy-1/4
zz-2/4
2/4 x 2/4 x 1/4 x 2/4 = 8/256
Dividing both numerator and denominator by 8 we get 1/32 so the 2nd option is right.
