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प्रश्न
What is a gene? How is it related to heredity?
उत्तर
Genes are hereditary units located on a chromosomal thread. A gene can be defined as the “ultimate unit of recombination, mutation, and self-reproduction”. They are responsible for various characteristics externally shown by the plants and animals. A single gene may affect one or more characteristics of offsprings.
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संबंधित प्रश्न
Choose the correct answer:
Mendel was born in __________
Give the significance of mutation.
Mutation alerts the hereditary material. Give reasons.
Differentiate Between Genotype and Phenotype.
Explain the term Alleles.
Give Technical Term:
A twin consisting of a brother and a sister were born to a lady. What is the name of such a type of twins?
Complete the following sentence with appropriate word:
The small differences among individuals are 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.
Enlist dominant and recessive characters in pea plant with respect to the position of flower, colour of seed and colour of a pod in tabulated form.
Each gamete has only one allele of a gene.
Hybrid is an offspring from a cross between genetically different parents.
A normal visioned woman whose father is colourblind married a normal visioned man. What are the probabilities of her sons or daughters to be colourblind? Explain with the help of Punnett square.
During a dihybrid cross with contrasting characters in the F2 generation, parental genotypes will appear in ______.
Two alternative forms of genes or alleles are located on ______.
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 |
In which region of chromosomes does crossing over take place?
Which one of the following character is recessive in case of a pea plant?
A pair of corresponding chromosomes of the same shape, size and one from each parent is called ______.
