Inheritance studies with inbred lines of maize having different activity levels of the AP 1 controlled acid
1Department of Field and Vegetable Crops, The Hebrew University, Faculty of Agriculture, Rehovot, Israel.
Abstract:
The genetic control of acid phosphatase-1 (AP 1) activity in pollen of maize was studied by crossing inbred lines having different AP 1 isozymes and different activity levels of the A P 1 enzyme. Usually, the intensities of the SS and FF isozyme bands were not equal in pollen of A P 1 (S) /A P 1 (F) heterozygous F 1 hybrids, but the relative intensities of the two bands were not correlated to the activity levels of the parental lines. The A P 1 (S) /A P 1 (S) and A P 1 (F) /A P 1 (F) F 2 populations differed in their mean level of activity. Both populations showed segregation in the activity levels indicating single gene control. The intensity ratios of the SS and FF bands in the different heterozygous A P 1 (S) /A P 1 (F) F 2 plants did not segregate. The results support the competition model for gene regulation proposed by Schwartz (1971).
Related Concept Videos
Monohybrid Crosses
Dihybrid Crosses
Incomplete Dominance
Epistasis Analysis
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
Law of Independent Assortment


