How to experimentally (by designing crossing) figure out if a given yellow and r

Question

How to experimentally (by designing crossing) figure out if a given yellow
and round pea is YYRR, YYRr, YyRR, or YyRr? Explain the crossing partner’s
genotype and the predicted phenotypes from each case and its phenotypic
ratio.
Question: the crossing partner’s genotype should be:
• If a given pea is YYRR, predicted phenotypes and their ratio will be
• If a given pea is YYRr, predicted phenotypes and their ratio will be
• If a given pea is YyRR, predicted phenotypes and their ratio will be
• If a given pea is YyRr, predicted phenotypes and their ratio will be

Explanation / Answer

Answer:

The cross of any individual to a homozygous recessive parent is called test cross.

Testcross can be used to determine if the individual is homozygous dominant or heterozygous

• If a given pea is YYRR, predicted phenotypes and their ratio will be

YYRR x YYRR = All the offsprings will be Yellow and round,

• If a given pea is YYRr, predicted phenotypes and their ratio will be

YYRr x YYRr

3-Yellow round

1-Yellow wrinkled

3:1 phenotypic ratio

• If a given pea is YyRR, predicted phenotypes and their ratio will be

YyRR x YyRR

3-Yellow round

1-green round

3:1 phenotypic ratio

• If a given pea is YyRr, predicted phenotypes and their ratio will be

YyRr x YyRr,

9-Yellow round

3-Yellow wrinkled

3-Green round

1-Green wrinkled

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