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प्रश्न
Distinguish between monohybrid and dihybrid cross.
उत्तर
| Monohybrid cross | Dihybrid cross |
The cross in which only one pair of contrasting characters is involved is known as a monohybrid cross. |
The cross in which only two pairs of contrasting characters are involved is known as a dihybrid cross. |
| A monohybrid cross is useful in determining the dominance of genes. | A dihybrid cross is useful in studying the assortment of the offspring. |
| example: a cross between a tall and dwarf plant. | example: a cross between a tall plant having a red flower and a dwarf plant having a white flower. |
APPEARS IN
संबंधित प्रश्न
Considering the relationship in the first pair, complete the second pair:
rr : Homozygous : : Rr : ....................
Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900. Give three reasons for the delay in accepting his work.
Describe quantitative inheritance controlled by two pairs of genes.
A pea plant which is homozygous for green pods which are inflated [GGII] is crossed with a homozygous plant for yellow pods which are constricted [ggii]. Answer the following questions;
a) Give the phenotype and genotype of the F1 generation.
Which type of pollination has occurred to produce F1 generation?
b) Write the phenotypic ratio of the F2 generation
c) Write the possible combinations of the gametes that can be obtained if two F1 hybrid plants are crossed.
d) State Mendel’s law of ‘Segregation of Gametes’
5) What is the scientific name of the plant which Mendel used for his experiments on inheritance?
Define the term heredity.
Choose the correct answer:
Mendel used ______ pairs of a characters for his experiments.
Give Reason:
Heritable variations are called genetic variations.
Long answer type question.
Explain with suitable example an independent assotrment.
When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be ______.
In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be ______.
A heterozygous violet-flowered pea plant is crossed to another homozygous violet- flowered pea plant. What percent of the progeny plants will have the recessive trait, i.e., white flowers?
If a round, green seeded pea plant (RRyy) is crossed with a wrinkled, yellow seeded pea plant (rrYY), the seeds produced in the F1 generation are ______.
Pure-bred pea plant A is crossed with pure-bred pea plant B. It is found that the plants which look like A do not appear in the F1 generation but re-emerge in the F2 generation. Which of the plant's A and B are tall and dwarf?
Which of the following characters can be acquired but not inherited?
Mendel selected pea as material for his experiments because:
In his cleric experiments on pea plants, Mendel did not use:
A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg).
- What colour of the stem would you expect in their F1 progeny?
- In what ratio would you find the green and purple coloured stem in plants of F2 progeny?
- What conclusion can be drawn for the above observations?
At which stage, did Mendel observe the segregation of alleles in garden pea plants?
Enumerate the cause and the characteristic symptom of PKU.
