Question

In: Biology

You cross a true-breeding dark orange flowered poppy with crinkly petals to a true-breeding white-flowered poppy...

You cross a true-breeding dark orange flowered poppy with crinkly petals to a true-breeding white-flowered poppy with smooth petals. The F1 poppies are light orange with smooth petals. In the F2 generation you get 201 orange crinkly poppies; 400 light orange smooth poppies; and 199 white smooth poppies. Explain this observation using all appropriate terminology. Also provide a breeding diagram that clearly links genotypes to phenotypes.

This is all that is given.

Solutions

Expert Solution

The crossing is between true breeding dark orange flowered poppy with crinkly petals to a true breeding white-flowered poppy with smooth petals.

Genotype of dark orange flowered poppy with crinkly petals can be represented by Ar/Ar and genotype of white flowered poppy with smooth petals can be represented by aR/aR as these genes are linked.

Here orange colour is a dominant character and crinkly petals is a recessive character.Also white flowered poppy is a ressive character and smooth petal is a dominant character.

By crossing we get

Parents Ar/Ar (Dark orange flower crinkly petals) x aR/aR(white flower smooth petals)   

Gametes Ar aR

F1 Ar/aR (Light orange flower ,smooth petals)

Dark orange colour is incompletely dominant over white colour and smooth petal is dominant trait

F2 by selfing F1.

F2 Ar/aR (Light orange flower ,smooth petal) x Ar/aR (Light orange flower,smooth petal)

The progenies are

Ar/Ar (Orange crinkly poppies) , Ar/aR (light orange smooth poppies)

aR/Ar (light orange smooth poppies), aR/aR (white smooth poppies)

They are in the ratio 1:2:1

Ar/Ar 201 orange crinkly poppies

Ar/aR 400 light orange smooth poppies

aR/aR 199 white smooth poppies

The result obtained is aslo in 1:2:1 ratio


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