Hybridization Techniques Questions and Answers

Answer: A

Sporophytic self-incompatibility occurs in cauliflower, a Brassica. In this system the pollen's behaviour is decided by the genotype of the plant that produced it, not by the genotype of the pollen grain, and it is used to produce hybrid seed in the cabbage family.

Cowpea, okra and onion do not rely on this system.

In sporophytic self-incompatibility the pollen's reaction is decided by the genes of the plant that made it. This system is found in the Brassicaceae, so cauliflower, cabbage and broccoli have it, and growers use it to produce F1 hybrid seed by crossing self-incompatible lines.

Answer: C

A backcross is the cross between an F1 hybrid and one of its parents. It is used to transfer a trait into the recurrent parent.

A single cross is between two inbred lines, a top cross is between a line and an open-pollinated variety, and a population cross is between two populations.

A backcross is made to restore or transfer characters of a parent into a hybrid line, and repeated backcrosses are used to transfer one gene into an elite variety. The cross between two inbred lines is called a single cross.