Related Experiment Video
Updated: May 5, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
Published on: August 12, 2019
Estimating heritability and genetic correlation between traits from generations F2 and F 3 of self-fertilizing
Abstract:
Three methods of estimation of heritability and genetic correlation between traits in the F2 and F3 generations of self-fertilizing species were compared. The methods were: 1. Subtracting the estimates of environmental variances and covariances from the corresponding phenotypic estimates in the segregating generation which yields 'broad-sense' heritability and genetic correlation. 2. Analyses of variance and covariance of full-sib families; correlations were calculated from the between-families components and heritability was estimated by using intraclass correlation. 3. Offspring on parent regression for single traits and pairs of traits which yields estimates of heritability and genetic correlation. Theoretically, the family-analysis method is superior to the two others, because those estimates are less affected by non-additive genetic variance and covariance. Actual estimates for six traits in peanuts and their 15 two-trait combinations were calculated only for the purpose of comparison between the three methods. These estimates seem to be in agreement with conclusions which were drawn from the theoretical considerations.
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...
Chi-square Analysis
The chi-square test was developed by Pearson in 1990.
The first step of performing a Chi-square analysis is to establish a null hypothesis, which assumes that there is no real...
Heritability
Dihybrid Crosses
Law of Independent Assortment
Law of Segregation

