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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
The phenotypic ratio of incomplete dominance is ______.
What is a gene? How is it related to heredity?
A pure tall plant (TT) is crossed with a pure dwarf plant (tt).
Draw Punnet squares to show
(1) F2 generation
(2) F2 generation.
Give the Phenotype of the F2 generation.
Explain the Term Heredity.
Give Technical Term:
A single egg was fertilized by a single sperm. But twins derived from that egg were born. What is the name of such type of twins?
Complete the following sentence with appropriate word:
______is the hereditary unit.
Complete the following sentence with appropriate word:
The physical expression of genes is called _________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Mutation can be brought about artificially.
Choose the Odd One Out
A recessive factor is altered by the presence of a dominant factor.
Hybrid is an offspring from a cross between genetically different parents.
Identify the possible genotypic ratio in F2 generation if a plant producing red flowers (RR) is crossed with another plant of the same species that produces white flower (rr).
The appearance of new combinations in the F2 generation of a dihybrid cross proves the law of ______.
A pea plant with the genotype YyRr is crossed with another pea plant with the genotype yyrr. The expected phenotypic ratio of individuals formed will be ______
Match the items given in Column I with those listed in Column II. Choose the answer with correct combination of alphabets of the two columns.
| Column I | Column II |
| A. Monohybrid cross | 1. T and t |
| B. Test cross | 2. TT |
| C. Alleles | 3. TT × tt |
| D. Homozygous tall | 4. tt |
| 5. Tt × tt |
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?
Name any two genetic diseases in humans.
