Advertisements
Advertisements
प्रश्न
Differentiate between the following -
Homozygous and Heterozygous
उत्तर
| Homozygous | Heterozygous |
| 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. |
| Both alleles of a trait, such as TT and tt, are similar. | It carries different alleles, such as Tt. |
| Homozygous individuals can carry either dominant or recessive alleles, but not both. | A heterozygous individual carries both dominant and recessive alleles. |
| It produces one type of gametes. | It creates two types of gametes. |
| It does not display excessive vigour. | Individuals can exhibit hybrid vigour, often known as heterosis. |
APPEARS IN
संबंधित प्रश्न
When a cross in made between tall plant with yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be
- Tall and green.
- Dwarf and green.
A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.
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.
Given below are the F2 – phenotypic ratios of two independently carried monohybrid crosses :
(i) 1 : 2 : 1
(ii) 3 : 1
Mention what does each ratio suggest.
Explain Mendel’s monohybrid progeny with the help of any one cross.
Mention whether the cross is a monohybrid or dihybrid.
Answer the following question.
Write the basis on which Alfred Sturtevant explained gene mapping.
What is a monohybrid cross? How did Mendel perform this cross?
Name the conditions when both the alleles are identical?
A garden pea plant produces axial white flowers. Another of the same species produced terminal violet flowers. Identify the dominant trait?
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 do the plants of the F1 generation look like?
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?
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.
Assertion (A): In humans, if gene (B) is responsible for black eyes and gene (b) responsible for brown eyes, then the colour of eyes of the progeny having gene combination Bb, bb or BB will be black only.
Reason (R): The black colour of the eyes is a dominant trait.
