Advertisements
Advertisements
प्रश्न
The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. With the help of a suitable example, work out a cross and explain how it is possible.
उत्तर
Monohybrid cross is a cross where two forms of a single trait are hybridised. Mendel crossed a pure tall pea plant with a pure dwarf pea plant and obtained all tall plants in the first filial generation. The character which appeared in the F1 generation is called the dominant character, whereas the character which is not expressed in the F1 generation is called the recessive character. After intercrossing the hybrids of the F1 generation, he obtained the tall and the dwarf progeny in the ratio 3:1 (phenotypic ratio), but the genetic ratio was 1:2:1 which is TT, Tt and tt.
APPEARS IN
संबंधित प्रश्न
A pea plant pure for yellow seed colour is crossed with a pea plant pure for green seed colour. In the F1 generation all pea plants were with yellow seeds. Which law of Mendel is applicable?
Select the most appropriate option
Which one of the following has the smallest number of chromosomes?
(a) Onion
(b) Mouse
(c) Monkey
(d) Ascaris
Define the following:
Allele
______ pairs of contrasting characters in pea plants were studied by Mendel in his experiments.
Which of the following crosses will give tall and dwarf pea plants in same proportions?
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be ______.
If a cross between two individuals produces offspring with 50% dominant character (A) and 50% recessive character (a) then the Genotypes of parents are:
Test Cross is a cross between:
Do you think Mendel’s laws of inheritance would have been different if the characters that he chose were located on the same chromosome.
