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Published on: February 14, 2020
Inheritance of emergence time at low temperatures in segregating generations of maize
1Plant Physiology Division, DSIR, Palmerston North, New Zealand.
Abstract:
North Carolina Design III and generation means analyses were used to study the inheritance of seedling emergence time and a related seedling growth parameter in crosses between 5-154, a line from CIMMYT Pool 5 with rapid seedling emergence under cool conditions, and two Corn Belt Dent lines of maize (Zea mays L.). The crosses were evaluated at low temperatures in controlled environment rooms. Additive genetic variances were larger than dominance variances in both crosses and estimates of the average levels of dominance were in the partial dominance range. Dominance was in the direction of rapid seedling emergence and rapid utilization of seed reserve. Estimates of minimum numbers of effective factors provided evidence for polygenic inheritance.
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Law of Segregation
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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...

