MEDIUM
10th CBSE
IMPORTANT
Earn 100
In humans, if gene B gives brown eyes and gene b gives blue eyes, what will be the colour of eyes of the persons having the following combination of genes?
(A) Bb
(B) bb
(C) BB
Important Questions on Heredity and Evolution
MEDIUM
10th CBSE
IMPORTANT
Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in generation but re-emerge in generation. Which of the plants A and B are: tall? Give reason for your answer.
MEDIUM
10th CBSE
IMPORTANT
Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are: dwarf? Give reason for your answer.
MEDIUM
10th CBSE
IMPORTANT
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1 generation are then cross-bred to produce F2 generation of pea plants.
What do the plants of F1 generation look like?
MEDIUM
10th CBSE
IMPORTANT
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1 generation are then cross-bred to produce F2 generation of pea plants.
What is the ratio of tall plants to dwarf plants in F2 generation?
MEDIUM
10th CBSE
IMPORTANT
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1 generation are then cross-bred to produce F2 generation of pea plants.
Which type of plants were missing in F1 generation but reappeared in F2 generation?
MEDIUM
10th CBSE
IMPORTANT
A plant has two varieties, one with red petals and the other with white petals. When these two varieties are cross-pollinated, all the offspring have red petals?
(A) Which gene is dominant?
(B) Choose suitable letters to represent the two genes.
MEDIUM
10th CBSE
IMPORTANT
A red-haired woman marries a brown-haired man, and all the children are brown-haired. Explain this genetically.
MEDIUM
10th CBSE
IMPORTANT
A black mouse mates with a brown mouse, and all the offspring are black.
(A) Why are no brown offsprings produced?
(B) If two of the black offspring mate with each other what kind of offspring would you expect and in what proportions? Give reason for your answer.
