Question

In pea yellow seed colour (y y ) is dominant over green seed colour (yy) .A pure yellow seeded pea plant is crossed to a pure green seeded .One give the f2 phenotypic ratio

Answer 1

when pure dominant is crossed with pure recessive heterozygous generation I.e.,f1 generation is formed when f1 is self crossed then f2 generation is formed which has a phenotype ratio of 3:1

YY×yy=Yy-f1

YyYy×YyYy=YY ,yy,Yy,Yy

3 yellow and 1 green