Advertisements
Advertisements
प्रश्न
Define the following:
Heterozygous
उत्तर १
Heterozygous - Diploid condition where both the alleles are different is called heterozygous.
उत्तर २
Heterozygous: An individual possessing contrasting (dissimilar) alleles for a particular trait is called heterozygous. It is a hybrid and does not breed true for that trait. e.g. Tt
संबंधित प्रश्न
Dominant character masks the ______________ characters.
A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason.
Give appropriate biological/technical terms for the following:
The type of immunity that exists in our body due to our genetic makeup.
Differentiate between Mendel’s monohybrid cross and dihybrid cross.
Explain the following term :
Heterozygous
State the three Mendel’s laws of inheritance.
Explain the following terms:
Laws of Inheritance
Choose the correct answer:
The allele which masks the effect of its complement is _______
What is a cross in which the inheritance of two pairs of contrasting characters are studied?
One of the reasons why law of segregation of gametes is universally applicable, is ______.
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?
What is the probability of production of dwarf offsprings in a cross between two heterozygous tall pea plants?
Independent inheritance of two separate traits, shape and colour of seeds in Mendel’s cross on pea plants resulted in a observable ratio of ______.
New species may be formed if
- DNA undergoes significant changes in germ cells
- chromosome number changes in the gamete
- there is no change in the genetic material
- mating does not take place
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have new combination of characters. Choose the new combination from the following
- Round, yellow
- Round, green
- Wrinkled, yellow
- Wrinkled, green
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 | __________________ |
The F1 generation has all tall, and F2 ratio 3 : 1, it proves:
If a cross between two individuals produces offspring with 50% dominant character (A) and 50% recessive character (a) then the Genotypes of parents are:
In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White = 128
Mention the genotypes of the two parents and of the four offspring types.
Tall pea plants having green pods were crossed with dwarf pea plants having yellow pods. Out of 80 plants, how many are likely to be tall plants in the F2 generation?
