In a cross between yellow round (YYRR) and gr | vedclass

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Question

(B) In a dihybrid cross between yellow round $(YYRR)$ and green wrinkled $(yyrr)$ seeds,the $F_{1}$ generation produces all yellow round $(YyRr)$ seed

Vedclass · Accepted Answer

$3: 1$

Vedclass · Answer

(B) In a dihybrid cross between yellow round $(YYRR)$ and green wrinkled $(yyrr)$ seeds,the $F_{1}$ generation produces all yellow round $(YyRr)$ seeds.When $F_{1}$ plants are self-pollinated,the $F_{2}$ generation phenotypic ratio is $9: 3: 3: 1$.This ratio consists of $9$ yellow round,$3$ yellow wrinkled,$3$ green round,and $1$ green wrinkled.To find the ratio of seed colours,we sum the phenotypes based on colour:Yellow seeds = Yellow round $(9) +$ Yellow wrinkled $(3) = 12$.Green seeds = Green round $(3) +$ Green wrinkled $(1) = 4$.The ratio of yellow to green seeds is $12: 4$,which simplifies to $3: 1$.This confirms that each trait follows the Law of Independent Assortment,where the inheritance of seed colour is independent of seed shape,resulting in a $3: 1$ monohybrid ratio for each character.

In a cross between yellow round $(YYRR)$ and green wrinkled $(yyrr)$ pea plants,find out the ratio between seeds having yellow and green seed colour in the $F_{2}$ generation.

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