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Learn about genetic inheritance, probability in plant breeding, Mendel's experiments with pea plants, heredity principles, and the influence of genes on eye color. Discover the fascinating world of genetics and how traits are passed from one generation to the next in humans and plants.
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An example of how several genes influence one trait is shades of eye color in humans. • The mathematical chance that something will happen is known as probability
If a plant with the genotype PP is crossed with a plant with the genotype pp, the possible genotypes of the offspring are Pp, Pp, Pp, Pp.
Chapter Six Test Notes Heredity
I will study tonight! • If a plant with the genotype Pp is allowed to self-pollinate, the possible genotypes are PP, Pp, pP, pp.
When a first-generation plant self-pollinates, the ratio of dominant to recessive traits in the second-generation plants is 3:1.
When parents with different traits are bred, a trait that reappears in the second generation after disappearing in the first generation is a recessive trait.
When a plant self-pollinates and all offspring have the same trait as the parent, it is called true-breeding plant. • Mendel removed the anthers of one plant to be sure that his pea plants did not self-pollinate.
Sperm from one plant fertilizes the eggs of the same plant in self-pollination. • The passing of genetic traits from parent to offspring is called heredity.
The ratio of dominant traits to recessive traits in second-generation plants is 3:1.
One gene influences eye color and fur color of a white tiger. • Recessive traits seem to disappear in the first generation.
During meiosis, the first time the nucleus divides, the homologous chromosomes separate. • Phenotype is an organism’s appearance.
Chromosomes that carry the same set of genes are called homologous chromosomes. • There are usually 46 chromosomes in a human body cell.
During the process of meiosis, four haploid cells are formed from the original diploid cell.
