Question

Question 1

Yellow seed color is dominant to green seed color. A green seeded plant is crossed with a heterozygous plant. What phenotypic and genotypic ratios would you predict in the offspring? If I planted 200 of these offspring, how many would be green? How many would be yellow? Explain how you solved the problem.

Answer 1

Given ,: Yellow seed colour is dominant over green seed colour.

A green seaded plant is crossed with heterozygous plant.

Let ;

Allele Y = Yellow seed colour - dominant allele.

Allele y = green seed colour - recessive

Since we know that recessive trait is only expressed in homozygous condition.

Therefore , genotype of given green seeded plant = yy

And genotype of heterozygous plant= Yy

Let cross them :-

P1:- Yy. X. yy

F1:-

Gametes	Y	y
y	Yy	yy
y	Yy	yy

Genotypic ratio : 2(Yy):2(yy)

Phenotypic ratio :- 2(Yellow seeded):2(green seeded)

If you planted 200 of this offspring then 100 would be Yellow seeded and 100 would be green seeded.