Question

HA)
Q36. A green stemmed rose plant denoted by GG and a brown stemmed rose plant denoted by gg are allowed
to undergo a cross with each other.
5
(a) List your observations regarding
(i) Colour of stem in their F, progeny
(ii) Percentage of brown stemmed plants in F2, progeny if F1, plants are self pollinated
(iii) Ratio of GG and Gg in the F2, progeny.
(b) Based on the findings of this cross, what conclusion can be drawn​

Answer 1

Answer: Following is the Punnette Square for F1 progeny

GG/gg g g

G Gg Gg

G Gg Gg

So, all plants of F1 generation will have green stem

Following the Punnette Square for F2 progeny

Gg/Gg G g

G GG Gg

g Gg gg

25% plants in F2 generation will have brown stem (gg)

Ratio of GG and Gg in F2 generation is 1 : 2

Conclusion from this cross: Every individual possesses a pair of alleles for a particular trait. During gamete formation, a gamete receives only one trait from the alleles. A particular trait can be dominant or recessive in a particular generation.

Explanation:

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