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OCR A Biology

Alleles Inherited Passed Dominant Expressed Present Homo Genotype/Phenotype

Genotype refers to the genetic makeup of an organism concerning a specific trait, determined by inherited alleles, while phenotype is the observable trait. Environmental modifications are not heritable, unlike genetic mutations. Alleles can be dominant or recessive, and an individual can be homozygous (two identical alleles) or heterozygous (two different alleles) for a gene.

Genotype is the combination of inherited alleles for a characteristic, while phenotype is the observable characteristic. Modifications due to environmental factors are not passed to offspring, only genetic changes (mutations). Alleles can be dominant (always expressed if present) or recessive (only expressed when two copies are present), and individuals can be homozygous (two identical alleles) or heterozygous (two different alleles).

Front genotype/phenotype, modifications/mutations, types of alleles (D/R and homo/hetero)
Back
  • 2 alleles inherited for most genes (one from each parent), geneotype is combination of alleles inherited for a characteristic (genetic makup of that gene), phenotype is observable characteristics
  • modifications (changes influenced by enviro) not passed onto offspring, only changes in DNA (mutations) passed on
  • dominant allele (version of gene always expressed if present), recessive allele (only expressed if 2 copies present), homozygous (2 identical alleles, either homo domiant or homo recessive), heterozygous (2 diff alleles, dominant allele always expressed)

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