The Virginia ground nut, Arachis hypogaea (a type \'runners,\" plants that sprea

Question

The Virginia ground nut, Arachis hypogaea (a type 'runners," plants that spread out, and others are "bunch," forming mor varieties for each growth habit. When a North Carolina true-breeding bunch variety was c true-breeding bunch variety, all the Fi plants were runners. The Fi plants were interbred bunch plants and 570 runners. of peanut) has two types of growth habits. Some varieties are e compact plants. There are true breeding crossed with a West Virginia resulting in an F2 of 430 A. List the possible genotypes of an Fi runner plant. B. List the possible genotypes of an F2 bunch plant Rr 1 b

Explanation / Answer

Since, the parents are true breeding strains, therefore, they will be homozygous. Also, the phenotype in F1 has masked the phenotype of the other parental gene, therefore, runner phenotype is dominant. Let R gene determines the growing habit. Thus,

Genotype of Runners will be RR

Genotype of bunch will be rr

the F1 generation produced from the cross will be heterozygous with Rr genotype and thus, all F1 progeny will be runners

When F1 plants are inbred

F1 phenotype = runners

F1 genotype = Rr

Gamates produced = R and r

F1 x F1

Rr x Rr

The genes will segregate independently to give all the possible combination, thus, the F2 generation will have the genotype RR, Rr and rr

where RR and Rr will be runners

And rr will be bunch

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