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प्रश्न
Differentiate between the following:
Homozygous and Heterozygous
Differentiate between homozygous and heterozygous.
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उत्तर
| Sr. No. | Homozygous | Heterozygous |
| 1. | It is pure for a trait and breeds true, producing homozygous individuals with similar characteristics. | A heterozygous individual is usually pure and generates offspring with diverse genotypes on selfing, such as TT, Tt, and tt on selfing of Tt individuals. |
| 2. | Both alleles of a trait, such as TT and tt, are similar. | It carries different alleles, such as Tt. |
| 3. | Homozygous individuals can carry either dominant or recessive alleles, but not both. | A heterozygous individual carries both dominant and recessive alleles. |
| 4. | It produces one type of gamete. | It creates two types of gametes. |
| 5. | It does not display excessive vigour. | Individuals can exhibit hybrid vigour, often known as heterosis. |
संबंधित प्रश्न
Differentiate between the following:
Dominance and Recessive
A child has blood group O. If the father has blood group A and the mother has blood group B, work out the genotypes of the parents and the possible genotypes of the other offspring.
How would you find out whether a given tall garden pea plant is homozygous or heterzygous? Substantiate your answer with the help fo Punnett squares.
Explain Mendel’s monohybrid progeny with the help of any one cross.
Mention whether the cross is a monohybrid or dihybrid.
What is a monohybrid cross? How did Mendel perform this cross?
A certain couple got four daughters in a sequence and no son. Does it mean that the husband does not produce Y-chromosome bearing sperms? Explain. What is the chance of this couple having a daughter?
Name the conditions when both the alleles are identical?
A pure tall plant (TT) is crossed with the pure dwarf plant (tt), what would be the F1 and F2 generations? Explain.
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the F1 generation are then selfed to produce F2 generation of pea plants.
What is the ratio of tall plants to dwarf plants in the F2 generation?
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the F1 generation are then selfed to produce F2 generation of pea plants.
Which type of plants was missing in the F1 generation but reappeared in the F2 generation?
Differentiate between inherited and acquired characters. Give one example for each type.
Give reasons why acquired characters are not inherited.
When a tall plant with rounded seeds (TTRR) is grossed with a Dwarf plant with wrinkled seeds (ttrr) the F1 generation consists of tall plants with rounded seeds. How many types of gametes the F1 plant would produce?
A Monohybrid cross is ______
Punnett square is used to know
In a monohybrid cross of plants with red and white flowered plants, Mendel got only red-flowered plants. On self-pollinating these F1 plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.
In a cross between red coloured and white coloured flowers, when plants with red coloured flowers of F1 generation were self pollinated, plants of F2 generation were obtained in which 75% of plants were with red flowers and 2.5% plants were with white flowers.
Explain the inheritance of traits in the above cross with the help of a flow chart only along with the ratio of plants obtained.
Given below is a schematic representation of the inheritance of the shape of the seeds of garden peas. Answer the questions that follow:
- Which is the dominant and recessive allele of the trait?
- What does the ratio 3 : 1 in the F2 generation represent?
- State Mendel's Law of Dominance.
Monohybrid crosses are useful in demonstrating which of the following laws of inheritance suggested by Mendel?
What is the genotype of the pure dwarf plant selected in the experimental sequence?
In the first filial generation, what is the observation for the cross \[TT \times tt\]?
Which self-pollination is performed to obtain the F2 generation?
Which gametes are produced by each \[Tt\] plant during selfing in F1?
What are the four genotypic outcomes of the cross \[Tt \times Tt\]?
What is the phenotypic ratio in F2?
What is the genotypic ratio in F2?
