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प्रश्न
What is the peculiarity of the ‘DNA’ structure?
उत्तर
Peculiarities of the DNA structure:
- DNA is a double helical structure having nucleotides.
- These nucleotides are made of deoxyribose sugar, phosphoric acid and nitrogenous bases such as adenine, thymine, cytosine and guanine.
- The nucleotide sequence of the DNA molecule is called a gene.
- Genes are present on DNA.
- A type of gene is responsible for the synthesis of a particular protein.
- Changes in the gene can alter the characteristics of the organisms.
संबंधित प्रश्न
Explain Monohybrid cross
Explain the law of independent assortment with a suitable example.
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
What is the phenotypic ratio and genotypic ratio of the above cross in (ii)?
Predict the genotype and phenotype of the following cross in pea.
TT x Tt
(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 ____________
Give Reason:
Discontinuous variations are inheritable.
Multiple Choice Question
Who among the following is called father of genetics?
Multiple Choice Question
What is the effect of sexual reproduction?
9 : 3 : 3 : 1 ratio is due to ______
Hybridization between Tt × tt gives rise to the progeny of ratio ______.
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?
Which of the following characters was not chosen by Mendel?
Which of the following crosses will give tall and dwarf pea plants in same proportions?
Law of independent assortment can be explained with the help of ______.
Read the following and answer from given below:
According to Mendel, one gene controls the expression of one character only. The ability of a gene to have multiple phenotypic effects because it influences a number of characters are an exception. The gene has multiple phenotypic effects because its ability to control two or more characters can be seen in cotton. In cotton, a gene for the lint also influences the height of the plant, size of the ball, number of ovules, and viability of seeds.
Genes with multiple phenotypic effects are known as ______
Select the group which shares maximum number of common characters
Mendel selected pea as material for his experiments because:
Test Cross is a cross between:
Which one of the given statements in incorrect:
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?
