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Unit 4A


Punnett Squares A diagram used by geneticists to determine the probability (chance) of an offspring having a particular phenotype.
Genotype The genetic makeup of an organism.
Phenotype The appearance of an organism based on its genotype, plus environmental factors.
Allele Variants (differences) in a gene that occurs on a fixed spot on a chromosome.
Heterozygous Carries two different alleles (Bb).
Homozygous Dominant Carries two copies of the same dominant allele (BB).
Homozygous Recessive Carries two copies of the same recessive allele (bb).
Gregor Mendel The “father of modern genetics”, born in 1822, a monk, in Austria Mendel discovered the basic principles of heredity through experiments with pea plants.
Dominant Traits Traits that hide other traits when passed on to offspring, and shows its specific trait even if only one parent passed the gene to the child.
Recessive Trait Traits that get hidden by dominant traits, and shows its specific trait when both parents pass the gene to the child.
Probability A chance of something being true and can be expressed as a percentage.
Genes A stretch of DNA on a chromosome with instructions for one trait, determine traits, and like chromosomes, they also come in pairs
Inherited Trait A characteristic or features of one organism that are inherited (passed from parent to offspring).
Heredity The transfer of traits from one generation to another generation.
Genetics The study of heredity, which is a biological process where a parent passes certain genes onto their offspring.
Created by: PRO Teacher dowdyp


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