Genetics Based Questions (Punnet Squares) Introduction : In fruit flies, red eye

ID: 278490 • Letter: G

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Genetics Based Questions (Punnet Squares)

Introduction: In fruit flies, red eye is the wild-phenotype, meaning it is the phenotype seen most frequently in nature. The white eye trait is due to a mutation that can be passed down form parents to offspring. Your overall goal in this lab will be to determine the inheritance pattern of this white eye trait.

The fruit flies in the table below are the F1 offspring of a cross between the following parents (P Generation): White Eyed Female X Red Eyed Male

1. Predict what would happen if we mated the F1 offspring to produce an F2 generation. Create a punnet square and determine the predicted phenotypic ratio of the F2 offspring.

F1 offspring of White Eyed Female X Red Eyed Male Red Eyed male Red Eyed Female White Eyed Male White Eyed Female Total 0 22 35 1

Explanation / Answer

Red eye is dominant(R)

And white eye recessive

Rr X rr

F1 Genotypes: Rr, Rr, rr, rr

For F2 generation

red eyed female X white eyed male

Rr X rr

Rr, Rr, rr, rr

Ratio will be 1:1

And white eyed female crossed with red eyed male

rr X rr

all progeny will be white eyed.

Ratio will be 4:0

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Genetics Background info: About 30% of the Irish population has red hair and an

Genetics Based Questions Introduction : In fruit flies, red eye is the wild-phen

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Genetics Based Questions (Punnet Squares) Introduction : In fruit flies, red eye

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