Correct Option-**(A) recessive homozygous**
Explanation -
The ** sickle-cell anaemia is caused by a gene HbS which is recessive. A marriage between two carriers of sickle-cell anaemia (HbA HbS ) will produce – normal ** with genotype (HbAHbA), sickle cell carriers with genotype (HbAHbS ) and sickle-cell anaemic with genotype HbS HbS . Sickle-cell anaemic *** leaving behind carriers and normal. Thus, the gene for sickle-cell anaemia (recessive gene) is lethal in homozygous condition.
