Question

Choose the correct answer from the alternatives given.
Match column I with column II and select the correct option from the given codes.

	Column I		Column II
A.	Dihybrid test cross	(i)	9 : 3:3: 1
B.	Law of segregation	(ii)	Dihybrid cross
C.	Law of independent assortment	(iii)	1: 1: 1: 1
D.	ABO blood group in man	(iv)	Purity of gametes
		(v)	Multiple allelism

• A. A - (iii), B - (iv), C - (ii), D - (v)
• B. A - (i), B - (iv), C - (ii), D - (v)
• C. A - (iii), B - (ii), C - (iv), D - (v)
• D. A - (ii), B - (v), C - (iii), D - (i)

Answer 1

Answer: (A)

A - (iii), B - (iv), C - (ii), D - (v)

A 1:1:1:1 ratio in a test cross of a dihybrid and a 9:3:3:1 ratio in a self of a dihybrid both reflect a gametic ratio of 1:1:1:1, which shows the allele pairs are assorting independently (generally because they are on different chromosome pairs). During gamete formation, the alleles for each gene segregate from each other so that each gamete carries only one allele for each gene. Hence, shows the purity of gametes. stating that when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production. Mendel arrived with the law by testing dihybrid cross between two traits or characters round/yellow and wrinkled/green. In the ABO blood group blood type exists as four possible phenotypes: A, B, AB, & O. There are 3 alleles for the gene that determines blood type.

So, the correct option is 'A - (iii), B - (iv), C - (ii), D - (v)',