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प्रश्न
Define the following:
Homozygous
उत्तर १
Homozygous - Diploid condition where both the alleles are identical is called homozygous.
उत्तर २
Homozygous (pure): An individual having identical alleles for a particular character is homozygous for that character. It is pure or true breeding for that trait. e.g. TT, tt.
संबंधित प्रश्न
In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).
(i) What is the phenotype and genotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flowers?
(ii) Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.
(iii) What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii)?
(iv) State Mendel’s Law of Dominance.
(v) Name two genetic disorders commonly seen in human males.
Both the parents contribute equal amount of ____________ material to the offspring
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
What is the phenotype and genotype of the F1 generation if a homozygous tall plant is crossed with a homozygous dwarf plant?
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
Draw a Punnett square board to show the gametes and offspring when both the parents are heterozygous for tallness.
Distinguish between monohybrid and dihybrid cross.
Define the following:
Recessive
Predict the genotype and phenotype of the following cross in pea.
TtRr x TtRr
(Capital letters show dominance)
Choose the correct answer:
The allele which masks the effect of its complement is _______
In heterozygous condition, both the alleles are expressed in ______
The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were ______.
Genes which code for a pair of contrasting traits are known as ______.
What is the probability of production of dwarf offsprings in a cross between two heterozygous tall pea plants?
Which of the following are reasons for Mendel’s success?
- Usage of pure lines or pure breeding varieties
- Consideration of one character at a time
- Maintenance of statistical records of experiments
- Knowledge of linkage and incomplete dominance
In the human blood grouping, the four basic blood types are type A, type B, type AB, and type O. They are ______
Why did Mendel choose pea plant for his experiments?
In the following crosses write the characteristics of the progeny
| Cross | Progeny |
| (a) RR YY × RR YY | __________________ |
| Round, yellow Round, yellow | __________________ |
| (b) Rr Yy × Rr Yy | __________________ |
| Round, yellow Round, yellow | __________________ |
| (c) rr yy × rr yy | __________________ |
| wrinkled, green wrinkled, green | __________________ |
| (d) RR YY × rr yy | __________________ |
| Round, yellow wrinkled green | __________________ |
In Mendel's experiments, colour of seed coat, nature of flower, position of flower, colour of pod, height of stem, are called
Assertion: Height in pea plants is controlled by the efficiency of enzymes and is thus genetically controlled.
Reason: Cellular DNA is the information source for making proteins in the cell.
In parents, mendelian factors occur in pairs, but they segregate during ______.
