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CBSE Class 10 Science 2020 Outside Delhi Set 1

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Question : 21 of 30
Marks: +1, -0
A green stemmed rose plant denoted by GG and a brown stemmed rose plant denoted by 98 are allowed to undergo a cross with each other.
(a) List your observations regarding
(i) Colour of stem in their F1F_1 progeny
(ii) Percentage of brown stemmed plants in F2F_2 progeny if F1F_1 plants are self pollinated.
(iii) Ratio of GG and Gg in the F, progeny.
(b) Based on the findings of this cross, what conclusion can be drawn?
Solution:  
(a) (i) Colour of stems in F1F_1 progeny will be all green.
(ii) The percentage of brown stem will be 25%25 \% i.e, one-fourth of the total number of progeny.
(iii) GG: GgGg is 1:21: 2
(b) Based on the findings of this cross this can be concluded that green stemmed plants are dominant whereas brown stemmed plants are recessive.
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