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Standard XII

Biology

What Is Gametogenesis

When a white ...

Question

When a white eyed male Drosophila is crossed with wild red eyed female in the $F_{2}$ generation the ratio of red and white eyed Drosophila is :

1 : 1

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2 : 1

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3 : 1

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1 : 3

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Solution

The correct option is C $3 : 1$
When a white eyed male Drosophila is crossed with wild red eyed female in the F1 generation is as follows:-

Male/Female Xw Y
Xr XwXr XrY
Xr XwXr XrY
The F2 generation after the cross between XrY and XwXr is as follows:-

Male/Female Xr Y
Xr XrXr XrY
Xw XwXr XwY
Thus the ratio of red and white eyed Drosophila is 3:1.
So the correct option is '3:1'.

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When a white eyed male Drosophila is crossed with wild red eyed female in the F2 generation the ratio of red and white eyed Drosophila is :

When a white eyed male Drosophila is crossed with wild red eyed female in the $F_{2}$ generation the ratio of red and white eyed Drosophila is :