Q10 of 47 Page 78

In the previous question, what are the combinations of character in the F2 progeny? What are their ratios?

A dihybrid cross shows inheritance of two different traits simultaneously. A cross between two dihybrid dominant recessive parents, gives phenotypic ratio 9:3:3:1 in progeny. All progeny in this cross will exhibit round yellow (RRYY), Round yellow (RrYy), Round green (RRyy), Round green (Rryy), wrinkled yellow (rrYY), wrinkled yellow (rrYy), wrinkled green (rryy).


This can be shown by following Punette Square:



More from this chapter

All 47 →
7

Give the basic features of the mechanism of inheritance.

 8

In the following crosses write the characteristics of the progeny

a). RRYY x RRYY (round yellow x round yellow)


b). RrYy x RrYy (round yellow x round yellow)


c). rryy x rryy (wrinkled green x wrinkled green)


d). RRYY x rryy (round yellow x wrinkled green)

 9

Study the following cross and showing self pollination in F1, fill in the blank and Solution the question that follows















Parents



RRYY


Round, yellow



x



rryy


wrinkled, green



F1 —



Rr Yy


Round, yellow



x



?


 11

Give reasons for the appearance of new combinations of characters in the F2 progeny.