Question

lab problem
the parent generation is homozygous yellowed podded and homozygous green podded pea plants. so when you cross a yellow podded pea plant with a green podded pea plant and you get 100% yellow podded plants in the f1 generation (phenotypic ratio 4 : 0, yellow to green). what will be the expected phenotypic ratio when you allow the f1 generation to reproduce and produce the f2?
fill out the punnett square.
gametes
phenotypic ratio of f2 offspring; yellow: __________ green: __________

Explanation:

Step1: Determine F1 genotype

Since crossing homozygous yellow - podded (YY) and homozygous green - podded (yy) gives 100% yellow - podded plants in F1, the F1 genotype is Yy.

Step2: Determine gametes

The F1 plants (Yy) produce two types of gametes: Y and y.

Step3: Fill Punnett square

	Y	y
y	Yy	yy

Step4: Calculate phenotypes

YY and Yy are yellow - podded (3 out of 4), yy is green - podded (1 out of 4).

Answer:

Yellow: 3, Green: 1