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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 heterozygous tall plant of pea is crossed with a dwarf plant of pea.
Calculate the phenotypic ratio of the progeny.
Explain the Term Heredity.
Explain the Term Heterosome.
Explain the Term Recessive character.
Explain the Term Genotype.
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 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:
Most genetic diseases in man are recessive in character.
Multiple choice question.
Phenotypic ratio of incomplete dominance in Mirabilis jalapa.
Explain a dihybrid cross with suitable example and checker board method.
Explain test cross with suitable example and state its ratios.
In a dihybrid cross with contrasting characters, the number of different genotypes obtained in F2 generation are ______.
______ type/s of gametes is/are expected to be formed by the organism with genotype AABBCC.
Alleles refer to ____________.
The percentage of each gamete out of four different types of gametes produced by the F1 dihybrid will be ________.
Mendel was successful in his experiments because:
A typical dihybrid cross is carried outbetween true breeding plant with yellowround seeds and a true breeding plant withgreen wrinkled seeds. With appropriatesymbol write the genotypes of —
- Homozygous dominant and recessive parents.
- Gametes produced by both the parents.
- Gametes produced by the F, hybrid. (3)
Which one of the following character is recessive in case of a pea plant?
Define the following term:
Gene
Name any two genetic diseases in humans.
