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The Mendelian Concept of a Gene Mendel instead believed that heredity is the result of discrete units of inheritance, and every single unit (or gene) was independent in its actions in an individual's genome. According to this Mendelian concept, inheritance of a trait depends on the passing-on of these units.
Typology: Lecture notes
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Chapter 12, part 1
X In this cross between two purple-flowered pea plants, one-quarter of the offspring have white flowers. Based just on this information, which is dominant: white or purple flowers? How do you know? Hint: “Dominance” is not based on numbers of individuals with the trait. It is based on the number of copies of the allele that must be inherited to show the trait.
The offspring of a purple-flowered pea plant and a white-flowered pea plant all have purple flowers. The purple trait is dominant. Why? true-breeding, purple-flowered plant First-generation offspring (F 1 ) Parental generation (P) pollen pollen cross-fertilize true-breeding, white-flowered plant
The purple-flowered trait is dominant because each an individual who inherits at least one copy of the purple allele (R) shows the purple phenotype. The white-flowered trait is recessive because an individual must inherit two copies of the white allele (r) to show the white phenotype. genotypes: phenotype
Solving problems involving dominance Dexter has freckles. So does his wife, Darla. Their son, Derek has no freckles. Is having freckles a dominant or a recessive trait?
_____________ parent gametes A A A A In modern terms, the ______________ parents in the P generation can pass on one kind of allele to their offspring. Homologous chromosomes gene
The ______________ parents of the F1 generation have two alleles for the gene in question, and can pass one or the other, but not both, to their offspring. ____________ parent gametes A a A a Homologous chromosomes gene