observed number of offspring white eyes 669 white eyes apter

observed number of offspring
white eyes: 669
white eyes, apterous wings : 240
white eyes, ebony body : 225
white eyes, Apterous wings, ebony body : 74

Test This Hypothesis Return to Menu Print Hypothesis Enter Your Hypothesis Enter your hypothesis for the offspring ratios that resulted from a mating. Replace the text with a number and click \"Test This Hypothesis\" to check if your ratio fits with the Chi Square analysis of the data. You may want to use a Punnett square to derive these ratios

Solution

1. white eyes: this is X-linked recessive inheritence

2. apterous wings: Autosomal recessive

3. ebony body: autosomal recessive

Ans: The given data having three characters (tri hybrid), but data showing di hybrid ratios(9:3:3:1). So If we exclude white eye (xlinked recessive) and consider only autusomal characters, then it is two hybrid cross , it follows the 9:3:3:1 ratio. Fits with chi square analysis.

1. All 1208 off springs are white eyes, so female parent is homozygous recessive, male parent is hemizygous recessive

2. Apterous represents: (aa), Ebony body : ee

AaEe* AaEe

off springs: 9 normal: 3 apterous wings: 3 ebony body: 1 apterous wing and ebony body

1208*9/16: 1208*3/16 : 1208*3/16: 1208*1/16

All chi square values <1 so it fit for null hypothesis.

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