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प्रश्न
Differentiate between Mendel’s monohybrid cross and dihybrid cross.
उत्तर
| Monohybrid Cross | Dihybrid Cross | |
| 1. | A cross between two pure organisms to study the inheritance of a single pair of contrasting characters. | A cross between two pure organisms to study the inheritance of two pairs of contrasting characters. |
| 2. | It produces a phenotypic monohybrid ratio of 3:1 in the F2 generation. | It produces a phenotypic dihybrid ratio of 9:3:3:1 in the F2 generation. |
| 3. | It produces a genotypic ratio of 1:2:1 in the F2 generation. | It produces a genotypic ratio of 1:2:1:2:4:2:1:2:1 in the F2 generation. |
| 4. | Example: Cross between tall and dwarf pea plants | Example: Cross of pea plants with round and yellow seeds and plants with wrinkled and green seeds |
APPEARS IN
संबंधित प्रश्न
Give appropriate biological/technical terms for the following:
The suppressed allele of a gene.
A homozygous tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf (t) plant bearing white (r) flowers :-
(i) Give the genotype and phenotype of the plants of F1 generation.
(ii) Mention the possible combinations of the gametes that can be obtained from the F1 hybrid plant.
(iii) State the Mendel’s law of Independent Assortment.
(iv) Mention the phenotypes of the off springs obtained in F2 generation.
(v) What is the phenotypic ratio obtained in F2 generation?
In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r) : Draw a Punnett square to show the gametes and offspring when both the plants have heterozygous round seeds (Rr).
Explain Monohybrid cross
Make a punnett square for finding out the proportion of different genotypes in the progeny of a genetic cross between.
A pure tall (TT) pea plant with a pure dwarf (tt) pea plant.
Suppose you are given two pairs of contrasting characters: Seed colour → yellow and green , seed coat → round and wrinkled.
Fill in the following table to show that F2 generation according to the principle of independant assortment as given by Mendel.
| Selfing among hybrids of F1 | RY | Ry | rY | ry |
| RY | ||||
| Ry | ||||
| rY | ||||
| Ry | ||||
| F2 generation |
Predict the genotype and phenotype of the following cross in pea.
TTrr x ttRR
(Capital letters show dominance)
Choose the correct answer:
If a homozygous tall plant is crossed with a heterozygous tall plant, the proportion of tall progeny would be ____________
Choose the correct answer:
The allele which masks the effect of its complement is _______
Define Mendel’s law of segregation.
A typical Mendelian dihybrid ratio of F2 generation is 3:1.
First geneticist/father of genetics was ______.
It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the ______.
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 ______.
In the human blood grouping, the four basic blood types are type A, type B, type AB, and type O. They are ______
Read the following and answer from given below:
Prashant wanted to find the genotype of a pea plant bearing purple coloured flowers in his kitchen garden. For this, he crossed purple-flowered plants with white-flowered plants. As a result, all plants which were produced had purple flowers only. Upon selfing these plants, 75 purple flower plants and 25 white flowers plants were produced. Now, he can determine the genotype of a purple-flowered plant by crossing it with a white-flowered plant.
In white-flowered plants, the allele is expressed in ______
Give the basic features of the mechanism of inheritance.
Test cross is when ______.
In Mendel's experiments, colour of seed coat, nature of flower, position of flower, colour of pod, height of stem, are called
The maternal grandfather of a boy is colorblind, but his maternal grandmother is normal. The father of the boy is also normal. What is the probability of this boy being colorblind?
