Which type of commercially cultivated hybrid will give the maximum degree of heterosis and uniform plants?

Correct option is A

A single cross hybrid is created by crossing two inbred parent lines, which are highly homozygous with similar alleles.

·         The resulting offspring (F1 generation) display high heterosis or hybrid vigor, producing superior traits compared to the parents.

·         The F1 generation inherits a uniform set of genes, resulting in high uniformity among plants, which is beneficial for commercial agriculture as it simplifies crop management and harvesting.

Other Options Explanations:

Option B: Double cross hybrid: A double cross hybrid is produced by crossing two single cross hybrids.

·         They also tend to be less uniform due to the increased genetic variability resulting from the crossing of two already heterozygous single cross hybrids.

Option C: Three cross hybrid: A three-way cross hybrid is produced by crossing a single cross hybrid with an inbred line.

Option D: Top cross hybrid: A top cross hybrid is produced by crossing an inbred line with an open-pollinated variety.