please help me answer this question. please write clear so i can understand. tha

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please help me answer this question. please write clear so i can understand. thank u so much for your help i really appreciate it. also please also answer both part of the question thank u so very much

Genetics 305 Lecture Quiz 3 June 28 2017 Question worth 20 each points please answer all part of the question in full sentences 1) . A true breeding red eyed male fruit fly was cross with a true breeding white eyed female fruit fly. The results of the F1 generation had a phenotypic ratio showing 50% red-eyed females, 25% red-eyed males, and 25% white-eyed males Please answer the flowing questions in full sentences to get full points A) From your understanding from the above cross phenotypic ratio What does these results says regarding the law of segregation and the X Linked traits. B) Predict the F2 cross from question one (draw a Punnett square) and also explain its significance to the F1 generation and the law of segregation.

Explanation / Answer

a. Red and white genes have segregated to appear in F1 generation.

In the fruit fly Drosophila(which, like humans, has XX females and XY males), there is a eye color gene called white that's found on the X chromosome, and a female fly will have two copies of this gene.

B.F2 generation is obtained byselfing of the results obtained from F1-

XrXR X XrY

  Xr   XR  

XrXr- white eyed female

XrXR- red eyed female

Xr y-White eyed male

XRy- white eyed male

Xr XrXr XrXR   y Xr y XRy

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