Question

3. Yellow seeds is a dominant characteristic in pea plants. Pure breeding pea plants for yellow seeds were crossed with pure breeding pea plants for green seeds. The F1 generation all exhibited yellow seeds. An F1 plant was crossed to a green plant. Of 800 F2 plants, how many are expected to exhibit green seeds? Show work for full credit.

Answer 1

TO SOLVE THIS QUESTION WE FIRST FIND THE GAMETES PRODUCED BY PARENTS THEN WE DRAW PUNNETT SQUARE FOR F1 PLANTS. FROM F1 PLANT AND GREEN PLANT CROSSING WE FIND F2 PLANTS . AND FROM F2 PLANTS WE FIND THE PROPORTION OF GREEN PLANTS AND FROM HERE WE FIND THE ANSWER.

3. is Yellow in pea recessive seeds plants a and Page- dominant characteristic green seeds is let and allele allele for for yellow green seeds is y seeds is y So, Chenotype Phenotype Yellow seeds Yellow Seeds Green Seeds s Pure breeding means homozygous condition. Pure were plants breeding peg plants for yellow crossed with pure breeding for green seeds. seeds bea peg plants for Genotype yellow of seeds pure breeding ry

Page 2 pea plants Genotype for green of pure breeding seeds → sy Hence, crossing these two - between x YY yy meiosis meiosis Gamete Gomete Punnett Square – -F plants Yellow seeds An ļ plant was crossed to a green plant - E plant Green plant - Yy . yy

Page 3 fi plant Green plant . yy meiosis meiosis Gamete Gamete Punnett square - ry Yellow gy plants y seeds Green seeds Proportion of yellow seeded plants Proportion of green seeded plants

Page 4 a 1 is since, green out of seeded plants plants. Hence, out of 800 plants - } * 800 = 400 will plants. be the green seeded Hence, answer is - of 800 Ę plants. 400 are expected to exhibit green seeds.