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प्रश्न
Mutation alerts the hereditary material. Give reasons.
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उत्तर
Mutation alerts the hereditary materiel of an organism's cell and results in a change in certain characters of traits. For example:
(a) Sickle-cell anemia is a blood disease caused by a gene mutation. The mutation causes a change in the DNA which controls the productivity of RBCs.
(b) Radioactive radiations also alter the gene structure and their effects can be seen generation after generation.
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संबंधित प्रश्न
Choose the correct answer:
Mendel was born in __________
Give the Phenotypic and Genotypic ratio of the F2 and F2 generation.
Explain the Term Variation.
Complete the following sentence with appropriate word:
______is the hereditary unit.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Most genetic diseases in man are recessive in character.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
DNA has a double-helical structure.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Genes are responsible for genetic characters.
Multiple Choice Question
A cross was made between tall and dwarf plants. In F1 generation all plants were tall, when the F1 plants were selfed, the tall and dwarf plants appeared in a 3 : 1 ratio in the F2 generation. This phenomenon is known as:
Explain a dihybrid cross with suitable example and checker board method.
Give any two points of difference between homozygous and heterozygous.
In a dihybrid cross with contrasting characters, the number of different genotypes obtained in F2 generation are ______.
Identify the genotype of peacock.
Using ______, the production of gametes by the parents, the formation of zygotes, the F1 and F2 plants can be understood.
Alleles refer to ____________.
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?
In which region of chromosomes does crossing over take place?
