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CBSE Class 10 Answered

Green and red colour of seeds recessive and dominant respectively. Out of F1 and F2 ,in which generation will the green seeds appear , if both parents are not hybrid. Explain by giving reasons.  what do u mean by hybrid in this case? Is the answer is that they will never appear??
Asked by sucharitasahoo1 | 04 Jan, 2018, 03:02: PM
answered-by-expert Expert Answer

Trait: Seed colour

Dominant trait: Red colour (RR)

Recessive trait: Green colour (rr)

Cross: Red seeds (RR) x Green seeds (rr)

Punnett square:

 

R

R

r

Rr

Rr

r

Rr

Rr

F1 generation:

100% red seeds (Rr)

F1 Cross: Red seeds (Rr) x Red seeds (Rr)

Punnett square:

 

R

r

R

RR

Rr

r

Rr

rr

F2 generation:

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

Genotypic ratio : 1 : 2 : 1 = RR : Rr : rr

Hybrid: Refer to a heterozygous condition. It is an offspring obtained by crossing two true-breeding (homozygous) individuals differing in the traits of interest.

Answered by Sheetal Kolte | 04 Jan, 2018, 03:32: PM

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