GCSE Biology - DNA Part 2 | Alleles | Phenotype vs Genotype

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*** WHAT'S COVERED ***
1. The role of genes in determining characteristics.
* Genes as segments of DNA coding for proteins.
* Characteristics determined by single or multiple genes.
2. The definition of alleles.
* Alleles as different versions or forms of the same gene.
3. The concepts of dominant and recessive alleles.
* How dominant alleles are always expressed when present.
* How recessive alleles are only expressed when two copies are present.
4. The distinction between homozygous and heterozygous conditions.
* Homozygous meaning having two identical alleles for a gene.
* Heterozygous meaning having two different alleles for a gene.
5. The difference between genotype and phenotype.
* Genotype referring to the combination of alleles an organism possesses.
* Phenotype referring to the observable characteristics resulting from the genotype.

*** CHAPTERS ***
0:00 Introduction & Recap of Genes
0:30 What is a Gene?
0:47 How Characteristics are Determined (Single vs Multiple Genes)
1:13 Alleles: Different Versions of Genes
1:39 Homozygous vs Heterozygous
2:03 Dominant vs Recessive Alleles
3:04 Genotype vs Phenotype

*** PLAYLISTS ***










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