Human somatic cells have 22 autosomal linkage groups. This is because humans possess 22 pairs of autosomes, each pair forming one linkage group for genes inherited together.

Question Breakdown

The query asks specifically for autosomal linkage groups (not total linkage groups) in human somatic cells, which include both male (46,XY) and female (46,XX) cells.

Option Analysis

• (1) 23: Incorrect; this reflects total chromosome pairs (22 autosomes + 1 sex pair), but linkage groups for autosomes alone are 22.​

• (2) 22: Correct; matches the 22 pairs of autosomes, where each pair defines one autosomal linkage group of linked genes.

• (3) 24: Incorrect; this applies to total linkage groups in human males (22 autosomes + X + Y as separate chromosomes).

• (4) 1: Incorrect; implies all genes link as one group, ignoring distinct chromosomes.​

Human somatic cells contain autosomal linkage groups human somatic cells totaling 22, crucial for understanding gene inheritance in biology exams like GATE Life Sciences. Autosomes are the 22 non-sex chromosome pairs carrying most genetic traits, forming linkage groups where genes on the same chromosome are inherited together.

What Are Linkage Groups?

A linkage group equals one chromosome set’s genes that don’t assort independently due to physical linkage. In humans, somatic cells have 46 chromosomes: 44 autosomes (22 pairs) + 2 sex chromosomes.

• Autosomal linkage applies only to these 22 pairs.

• Sex linkage (X/Y) is separate, varying by male (24 total groups) or female (23 total).

Why 22 for Autosomes?

Each of the 22 autosomal pairs represents one linkage group in diploid somatic cells. This holds for both sexes, as autosomes are identical in number.

Exam Relevance

For competitive exams, remember: autosomal linkage groups human somatic cells = 22 (option 2). Total linkage groups differ—23 in females, 24 in males—but the question specifies autosomes. This distinction avoids common traps in genetics MCQs.