Q9 of 47 Page 78

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



?


A dihybrid cross shows inheritance of two different traits simultaneously. In the given question, when pure breeding dominant parent plant (RRYY) crossed with pure breeding recessive parent plant (rryy), it give heterozygous dominant progeny in F1 generation. All progeny in this cross will have genotype RrYy and exhibit round yellow. Self-cross of F1 progeny will give F2 generation.


More from this chapter

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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)

 10

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

 11

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