Advertisements
Advertisements
Question
A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by ww.
(a) What is the expected colour of the flowers in their F1 progeny?
(b) What will be the percentage of plants bearing white flower in F2 generation, when the flowers of F1 plants were selfed?
(c) State the expected ratio of the genotype BB and Bw in the F2 progeny.
Advertisements
Solution
(a) The expected colour of flowers in their F1 progeny is blue.
(b) 1/4 of the F2 generation have white flowers. So, we can calculate the percentage as follows:-
1/4 × 100 = 25%
Hence, the percentage of plants bearing white flowers in F2 progeny is 25.
(c) The ratio of the genotype BB and Bw in the F2 progeny is 1 (BB) : 2 (Bw).
APPEARS IN
RELATED QUESTIONS
How do Mendel’s experiments show that the traits may be dominant or recessive?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Name the first scientist who studied the inheritance of traits from one generation to the next.
Name the scientist who gave the laws of inheritance.
What sizes of plants are produced if both parents have genes Tt?
Why did Mendel choose pea plants for conducting his experiments on inheritance?
How do Mendel's experiments show that traits are inherited independently?
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1generation are then cross-bred to produce F2 generation of pea plants.
(a) What do the plants of F1 generation look like?
(b) What is the ratio of tall plants to dwarf plants in F2 generation?
(c) Which type of plants were missing in F1 generation but reappeared in F2 generation?
A red-haired woman marries a brown-haired man, and all the children are brown haired. Explain this genetically.
What are the components of the DNA molecule?
