Dominant Alleles
A dominant allele is a variant of a gene that expresses its associated phenotype even when only one copy is present. An individual with at least one dominant allele, whether in a heterozygous (e.g., Bb) or homozygous (e.g., BB) state, will exhibit the dominant trait.
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Dominant Alleles
Recessive Alleles
Genotype vs. Phenotype
Gene-Environment Interactions
Homozygous
Heterozygous
Epigenetics
Identical twins originate from a single fertilized egg that splits, meaning they start life with the same complete set of inherited genetic instructions. Imagine one twin is raised in a family of musicians and becomes a concert pianist, while the other is raised in a family of athletes and becomes a professional soccer player. Which statement accurately describes their underlying genetic foundation?
Dominant Alleles
Recessive Alleles
Punnett Square
Gene-Allele Interaction for Hair Color
Homozygous
Heterozygous
Genetic Diversity Within and Between Human Races
A single gene is responsible for determining whether a pea plant's flowers are purple or white. What accounts for the difference in flower color between two different pea plants?
A specific gene in a species of plant is responsible for determining the color of its flowers. Within this plant species, some flowers are red, while others are white. What term best describes the different variations of this single gene that result in either red or white flowers?
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Cleft Chin as an Example of a Monogenic Trait
A researcher crosses a pea plant that comes from a long line of only yellow-seeded plants with a pea plant that comes from a long line of only green-seeded plants. The researcher observes that all of the resulting offspring plants produce only yellow seeds. Based on this single-generation outcome, what is the most logical conclusion about the genetic variants for seed color?