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Chapter 9 Vocab

Terms

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Incomplete Dominance
When both alleles are present: appears as blending
Trait
A genetically determined variant of a characteristic
Multiple Alleles
More than two alleles for a genetic trait
Molecular Genetics
Study of the structure of nucleic acids and the function and regulations of genes
Complete Dominance
a relationship in which one allele is completely dominant over another
F1 Generation
The first generation of offspring
Heredity
Passing of genetic traits from a parent to a offspring
Dominant
Describes the allele that is fully expressed when carried by only one homologous chromosome
True-Breeding
describes organisms or genotypes that are homozygous for a specific trait
Homozygous
Identical alleles for a trait
Cross-Pollination
A reproductive process in which pollen from one plant is transferred to the stigma of another plant
Dihybrid Cross
cross between different individuals that have different alleles for the same gene
Recessive
Describes an allele or a trait that is expressed only when two recessive alleles for the same characteristics are inherited
Inheritance
Transmission, from parents to offspring, of genes that underlie the traits characteristic of their species.
Heterozygous
Describes an individual that has two different alleles for a trait
Probability
the likelihood that a possible future event will occur in any given instance of the event; the mathematical ratio of the number of times one outcome of any event is likely to occur to the number of possible outcomes to the event
Allele
one of the alternative forms of a gene that governs a characteristic, such as hair color
Codominance
a condition in which both alleles for a gene are fully expressed
Testcross
the crossing of an individual of unknown genotype with a homozygous recessive individual to determine the unknown genotype
Genetics
The science of heredity and of the mechanisms by which traits are passed from parents to offspring
Self-pollination
The transfer of pollen grains from an anther to the stigma of the same flower or the stigma of another flower of the same plant
F2 Generation
The second generation of offspring

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