Inheritance160-page11 - colors • Since diploid organisms...

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Inheritance Patterns - 11 Some terms used in Mendelian Inheritance Tests True Breeding A plant that produces offspring with the same characteristics. The parental generation is a true-breeding generation. Cross Breeding A cross between different parental types Offspring produced by cross breeding are called hybrids F 1 Generation The first generation Generally first generation offspring are bred among themselves to produce the second generation. In Mendel's pea plants they self-fertilized. F 2 Generation The second generation Mendelian ratios are based on second generation results Punnett Square A method of visualizing Inheritance crosses Gene The physical unit of heredity; the instructions for producing a specific characteristic or trait. For example, the characteristic or gene may be flower color. The alternative forms a gene can have would be the specific flower
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Unformatted text preview: colors. • Since diploid organisms have two sets of chromosomes (the homologous chromosome pairs), most "genes" are paired, often called the gene pair Alleles • The alternative forms or variations a gene can have, such as brown or blue for eye color, or red or white for flower color. • A diploid individual will have two alleles for each gene locus. • Within a population there can be more than two alleles for a gene, but only two alleles will be present in any one diploid individual. Locus • The region on a chromosome where a gene is located. • The alleles of a gene are located at equivalent places (loci) on the homologous chromosomes Homozygous • The 2 alleles for a gene are the same in an individual Heterozygous • The 2 alleles for a gene are different in an individual...
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