Crossing over is the exchange of genetic material between homologous chromosomes during meiosis, which leads to variation in offspring.
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Question
What is crossing over?
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Solution
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A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
- Represent this cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.
- Write the conclusion you draw of the inheritance pattern of this disease.
Write a note on sex linkage.
Which of the following statement/s are INCORRECT with respect to crossing over?
i. Crossing over produces recombinations of genes by interchanging and exchanging corresponding segments between nonsister chromatids of homologous chromosomes.
ii. Crossing over occurs during zygotene of prophase I of meiosis.
The distance between the genes is measured by ______.
Blue eye colour is recessive to brown eye colour. A brown-eyed man whose mother was blue-eyed marries a blue-eyed woman. The children shall be ______.
A and B genes are linked. What shall be the genotype of progeny in a cross between AB/ab and ab/ab?
Which of the following is a test cross?
Mendal formulated the law of purity of gametes on the basis of ______.
What is the pattern of inheritance in the above pedigree chart?

When the parental gene combine with itself; termed as
