A round seeded plant ( R ) is dominant to a wrinkled seeded plant ( r). What parental genotypes will produce offspring that are 50% homozygous dominant and 50% heterozygous dominant ?

rr and RR

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RR and Rr

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Rr and Rr

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rr and rr

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Solution

The correct option is B
RR and Rr

With the Parental genotype as RR and Rr, following cross will take place.

R R X R r
$\begin{matrix} R & R R & R R & R R H o m o z y g o u s & H o m o z y g o u s r & R r & R r H e t e r o z y g o u s & H e t e r o z y g o u s \end{matrix}$
Thus 50% of the offsprings will be homozygous round seeded whereas 50% will be heterozygous round seeded plants.

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A round seeded plant ( R ) is dominant to a wrinkled seeded plant ( r). What parental genotypes will produce offspring that are 50% homozygous dominant and 50% heterozygous dominant ?

The correct option is B RR and Rr With the Parental genotype as RR and Rr, following cross will take place. R R X R r RRRRRRRHomozygousHomozygousrRrRrHeterozygousHeterozygous Thus 50% of the offsprings will be homozygous round seeded whereas 50% will be heterozygous round seeded plants.