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CBSE Class 10 Answered

In pea plant the trait of yellow seed (YY) is dominant over green seed (yy). explain the inheritance pattern of F1 and F2 generation with the help of a cross following the rules of inheritance of traits. Show the visible characters if F1 and F2 progeny and write the genotypic ratio and percentage
Asked by malasarathy75 | 04 Jan, 2020, 04:43: PM
answered-by-expert Expert Answer

Dominant trait: Yellow colour (YY)

Recessive trait: Green colour (yy)

Cross: Yellow seeds (YY) x Green seeds (yy)

Punnett square:

 

Y

Y

y

Yy

Yy

y

Yy

Yy


F1 generation:

100% yellow seeds (Yy)

F1 Cross: Yellow seeds (Yy) x Yellow seeds (Yy)

Punnett square:

 

Y

y

Y

YY

Yy

y

Yy

yy


F2 generation:

Phenotypic ratio: 3 :1 = Yellow seeds : Green seeds

Genotypic ratio : 1 : 2 : 1 = YY : Yy : yy

Answered by Sheetal Kolte | 08 Jan, 2020, 03:37: PM

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