To make some extra money this summer you decided to help out at a local organic

Question

To make some extra money this summer you decided to help out at a local organic berry farm. One day while out picking strawberries you noticed that some of the strawberry plants were producing red berries, whereas others were producing purple berries Plant produces red strawberries Plant produces purple strawberries You asked the farmer who owns the berry patch about this observation. He said that a plant that produced red strawberries was self-crossed and the resulting seeds collected and planted. Then in the next generation of plants, 678 plants produced red strawberries, and 211 plants produced purple strawberries

Explanation / Answer

Red = Dominant = R

Purple = Recessive = r

a. Genotype of parent red plant = Rr

Parental cross: Rr X Rr

Progeny: RR Rr Rr rr

Phenotypic ratio = 3:1 =~678:211

b. Parental cross: Rr X rr

Progeny: Rr Rr rr rr

Phenotypic ratio = 1:1 = Red:Purple

c. Parental cross: RR X Rr

Progeny: RR Rr RR Rr

Phenotypic ratio = 1 = All Red

d. Parental cross: Rr X rr

Progeny: Rr Rr rr rr

Phenotypic ratio = 1:1 = Red:Purple

e. Parental cross: rr X rr

Progeny: rr rr rr rr

Phenotypic ratio = 1 = All Purple

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