Related Experiment Video
Updated: May 6, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
Published on: August 12, 2019
Generative transmission of the extra chromosome in a rye tertiary trisomic and its relation with inbreeding
1Department of Genetics, Agricultural University, Dreijenlaan 2, NL-6703, Wageningen, HA, The Netherlands.
Abstract:
Transmission of the extra (translocated) chromosome of tertiary trisomic T282W of rye (Secale cereale L.) upon seifing, through the male and/or the female, ranged from 0% to 36% in different inbred lines. Tetrasomics arising from simultaneous male and female transmission were not recovered and thus apparently not viable. Low seed weight, poor seed germination and a low transmission rate were correlated with low seed weight and reduced plant vigour. Inbreeding depression was concluded to affect transmission rate through its effect on the relative viability of trisomic seeds or seedlings.Male transmission in testcrosses with disomics averaged 7%, but varied between lines. Genetic factors were involved, but their expression remains uncertain. Pollen quality, as determined by a fluorescence reaction, was somewhat lower in trisomics than in disomics of the same genetic background and was not correlated with male transmission rate, which appears to be determined mainly by relative pollen-tube growth of euploid and aneuploid gametophytes. The results are discussed in relation to the use of tertiary trisomics in balanced chromosomal systems for hybrid breeding.
Related Concept Videos
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...
Dihybrid Crosses
Law of Segregation
Incomplete Dominance
Test Cross
Chromosomal Theory of Inheritance

