Back to Mendel\'s pea plants... We make a dihybrid cross of genotype Ppli and ge

Question

Back to Mendel's pea plants... We make a dihybrid cross of genotype Ppli and genotype Ppli. The gene symbols are as follows: P: purple petals p: white petals 1: inflated pods i: pinched pods Both of the parents (the dihybrids) have a phenotypeof purple petals and inflated pods. We also know that the genetic mechanism is simple dominance for both genes, and that inheritance of one gene is not affected by inheritance of the other gene We see four phenotypes in the progeny: 1. Purple petals and inflated pods 2. Purple petals and pinched pods 3. White petals and inflated pods . White petals and pinched pods

Explanation / Answer

Example of answer

Format

Purple petal and inflated

pod

Purple petal and pinched

pod

White petal inflated

pod

White petal pinched

pod

400 1600 +2 400 200

Expected Observed O-E O-E2 O-E2 /E

Example of answer

Format

Purple petal and inflated

pod

433 866 +2 433 216.5

Purple petal and pinched

pod

345 345 +2 345 177.5

White petal inflated

pod

303 303 +1 303 151.5

White petal pinched

pod

43 86 +2 43 21.5

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