A cross between a white-eyed female and a red | vedclass

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(C) The inheritance pattern described is sex-linked inheritance in Drosophila,first studied by Calvin Bridges. Normally,a white-eyed female $(X^wX^w)$

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Non-disjunction of $X$ chromosomes in the female

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(C) The inheritance pattern described is sex-linked inheritance in Drosophila,first studied by Calvin Bridges. Normally,a white-eyed female $(X^wX^w)$ crossed with a red-eyed male $(X^WY)$ produces red-eyed females $(X^WX^w)$ and white-eyed males $(X^wY)$. However,the appearance of white-eyed females and red-eyed males is an exception to the standard Mendelian inheritance pattern. This occurs due to the failure of the two $X$ chromosomes to separate during meiosis in the female,a phenomenon known as non-disjunction. When non-disjunction occurs,the female produces gametes with two $X$ chromosomes $(XX)$ and gametes with no $X$ chromosome $(O)$. When an $XX$ egg is fertilized by a $Y$ sperm,it results in an $XXY$ female (white-eyed),and when an $O$ egg is fertilized by an $X^W$ sperm,it results in an $X^WO$ male (red-eyed).

$A$ cross between a white-eyed female and a red-eyed male Drosophila gives red-eyed females and white-eyed males. Occasionally,the cross gives white-eyed females and red-eyed males. This is due to:

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