GCSE Biology - DNA Part 2 - Alleles / Dominant / Heterozygous / Phenotypes and more! #64

The video tutorial explains key genetic terms such as alleles, dominance, and the difference between genotype and phenotype. It discusses how genes, which are DNA segments coding for proteins, determine traits. Alleles are different versions of a gene, and individuals inherit two alleles for each gene, one from each parent. The video also covers how dominant alleles are expressed over recessive ones, using examples like fur color in mice. Finally, it distinguishes between genotype, the genetic makeup, and phenotype, the observable traits.

How do dominant and recessive alleles affect the expression of traits?

Describe the relationship between genotype and phenotype.