In a dihybird cross between two heterozygotes, AaBb x AaBb, if we get 3:1 ratio among the offspring, the reason for this may be:
Important Questions on Principles of Inheritance and Variation
Assertion (A): The proportion of parental gene combinations was much lighter than non-parental type
Reason (R): Gene combination is due to linkage of the two genes
Give one significant difference between the following:
Linkage and crossing over
Given below are two statements one is labelled as: Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Mendel's law of independent assortments does not hold good for the genes that are located closely on the same chromosome.
Reason (R): Closely located genes assort independently.
In light of the above statements, choose the correct answer from the options given below:
The following family tree traces the occurrence of a rare genetic disease. The filled symbols signify the individuals with the disease, whereas the open symbols signify healthy individuals.
Based on this information, the disease is most likely to be:
