Question

1. A green stemmed rose plant denoted by GG and a brown stemmed rose plant denoted by gg is
allowed to undergo a cross with each other.
(a)List your observations regarding
(i)Colour of the stem in their F1 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 finding of this cross, what conclusion can be drawn?
2. How did Mendel’s experiments show that different traits are inherited independently? Explain.
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Answer 1

Answer:

(a) List your observations regarding

Colour of stem in their F1 progeny.

Percentage of brown stemmed plants in F2 progeny if F1 plants are self pollinated.

Ratio of GG and Gg in the F2 progeny

(b) Based on the finding of this cross, what conclusion can be drawn?

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:

answer 2Mendel crossed two pea plants differing in contrasting traits of two characters i.e a dihybrid cross.

He crossed a pea plant having yellow coloured and rounded seeds with another pea plant having green coloured and wrinkled seed.

The F

1

generation has all round and yellow seeds.

The F

2

generation, all the characters inherited independently. (round yellow, round green, wrinkled yellow, wrinkled green.

solution

Answer 2

Explanation:

1. a)

i) The colour of stem in F1 progeny will be green

ii)25%

iii)1:2

b)Green stemmed plant are dominant and brown stemmed plant are recessive.

2.Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independent assortment