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Pea plant has Round Seed dominant over Wrinkled Seed.

Round Seed allele is R

Wrinkled Seed allele is p

Hom.ozygous Dominant Alleles: RR (Round Seed)

Heter.ozygous Dominant Alleles: Rr (Round Seed)

Hom.ozygous Recessive Alleles: rr (Wrinkled Seed)

Whenever we cross Heter.ozygous Dominant(Rr) with Hom.ozygous recessive (rr), we get 50% ROUND SEEDS PHENOTIPICALLY(physical appearance), Because as you can see in the picture,

The P1 is Rr

The P2 is rr

When we cross them,

It has 4 offsprings,

Rr Round Seed

Rr Round Seed

rr Wrinkled Seed

rr Wrinkled Seed

Thus the answer is 50% round seed as there are 2 out of 4 heter.ozygous dominant round seed.

Whenever we cross Hete.rozygous Dominant(Rr) with another Heter.ozygous Dominant (Rr), we get 75% ROUND SEEDS PHENOTIPICALLY(physical appearance), Because as you can see in the picture,

The P1 is Rr

The P2 is Rr

When we cross them,

It has 4 offsprings,

RR Round Seed

Rr Round Seed

Rr Wrinkled Seed

rr Wrinkled Seed

Thus the answer is 75% round seed as there are 3 out of 4 hom.ozygous and hete.rozygous dominant round seed.

Whenever we cross Homo.zygous Dominant(RR) with Heter.ozygous Dominant (Rr), we get 100% ROUND SEEDS PHENOTIPICALLY(physical appearance), Because as you can see in the picture,

The P1 is RrR

The P2 is Rr

When we cross them,

It has 4 offsprings,

RR Round Seed

RR Round Seed

Rr Wrinkled Seed

Rr Wrinkled Seed

Thus the answer is 100% round seed as there are 4 out of 4 hetero.zygous and homo.zygous dom.inant round seed.