In: Biology
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.
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