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प्रश्न
What is crossing-over? What are the factors affecting it?
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उत्तर
Crossing-over is the interchange of the parts of the chromatid of a pair of chromosomes. High temperature, X-rays and radiation treatment are the factors affecting crossing-over.
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संबंधित प्रश्न
- A pure tall plant (TT) is crossed with a pure dwarf plant (tt). Draw Punnett squares to show
- F1, generation
- F2 generation.
- Give the phenotype of F2 generation.
- Give the phenotype and genotypic ratios of the F1 and F2 generations.
Explain the Term Dominance.
Explain the Term Mutation.
Explain the Term Crossing-over.
Complete the following sentence with appropriate word:
______is the hereditary unit.
Complete the following sentence with appropriate word:
The dissimilar pairs of genes present in an individual are known as _______________.
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.
Multiple choice question.
In a dihybrid cross, F2 generation offsprings show four different phenotypes while the genotypes are _______.
Multiple choice question.
A cross between an individual with an unknown genotype for a trait with recessive plant for that trait is _______.
What is allelomorph?
A recessive factor is altered by the presence of a dominant factor.
Identify the genotype of peacock.
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 ______
Which one of the following genotype will yield only one type of gamete?
Two alternative forms of genes or alleles are located on ______.
Mendel was successful in his experiments because:
In which region of chromosomes does crossing over take place?
