Inheritance of flower color in pickerelweed (Pontederia cordata L.)

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Gamete Collection and In Vitro Fertilization of Astyanax mexicanus
10:52

Gamete Collection and In Vitro Fertilization of Astyanax mexicanus

Published on: May 25, 2019

Lyn A Gettys1, David S Wofford

  • 1Department of Agronomy, Plant Genetics and Breeding, University of Florida Institute for Food and Agricultural Sciences, Gainesville, FL 32611-0500, USA. lgettys@ufl.edu

The Journal of Heredity
|August 22, 2007
PubMed

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Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Monohybrid Crosses01:20

Monohybrid Crosses

Overview
Dihybrid Crosses01:18

Dihybrid Crosses

Overview
Test Cross01:39

Test Cross

Alleles are different forms of the same gene. Humans and other diploid organisms inherit two alleles of every gene, one from each parent.
Law of Segregation01:49

Law of Segregation

When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
Trihybrid Crosses02:27

Trihybrid Crosses

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 chance to...