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4.Principles of Inheritance and Variation
normal
Which of the following diseases results from the genetic inability to synthesize a single enzyme?
A
Colour blindness
B
Down's syndrome
C
Phenylketonuria
D
Crossing over
Solution
W Bateson $(1905)$ explained the lack of independent assortment in sweet pea and T H Morgan $(1910)$ in Drosophila due to linkage. When genes closely present adhere or link together in a group and transmitted as a single unit, the phenomenon is called linkage. It stops the process of independent assortment. Incomplete linkage is broken down due to the crossing over.
Standard 12
Biology
