Match List-I with List-II
| List-I Terms | List-II Features |
|---|---|
| (A) Allele | (I) The position on the chromosome where a gene occurs |
| (B) Locus | (II) Testing a suspected heterozygote by crossing it with a known homozygous recessive |
| (C) Gene | (III) One of two or more alternative nucleotide sequences at a single gene locus |
| (D) Test Cross | (IV) A length of DNA that codes for a particular polypeptide or protein |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
(A) Allele — this matches (III) One of two or more alternative nucleotide sequences at a single gene locus. Alleles are different forms of the same gene, such as T and t for tallness. They sit at the same place on a pair of chromosomes but differ slightly in their base sequence.
(B) Locus — this matches (I) The position on the chromosome where a gene occurs. Locus means place. Each gene has a fixed position on its chromosome.
(C) Gene — this matches (IV) A length of DNA that codes for a particular polypeptide or protein. A gene is the unit of inheritance. It is a stretch of DNA whose base sequence gives the order of amino acids in one polypeptide.
(D) Test Cross — this matches (II) Testing a suspected heterozygote by crossing it with a known homozygous recessive. A dominant-looking plant may be TT or Tt. Crossed with a recessive (tt) plant, a TT parent gives all dominant offspring, while a Tt parent gives dominant and recessive in a 1:1 ratio.