Inheritance Flashcards
what are alleles
alleles are a different form of the same gene
what do alleles determine in people
alleles determine the characteristics that person may have
what two things can alleles either be
alleles may either be dominant or recessive
what is a dominant allele always
a dominant allele is always expressed regardless of the identity of the other allele
how many copies of the dominant allele is required for it to be expressed
only one copy of the dominant allele is required to be expressed
E.g. BB or Bb
what is the dominant allele represented by
The dominant allele is represented by a capital letter
when is a recessive allele expressed
a recessive allele is expressed when the other allele is also recessive
what is the recessive allele represented by
it is represented by a lower case letter
how many copies does a recessive allele need to be expressed
2 copies are required of the recessive allele to be expressed
what is a phenotype
a phenotype is an observed characteristic of an individual
what is the phenotype determined by
the phenotype is determined by the interaction between the genotype and the environment
give an example of a phenotype
earlobes being attached or not is an example of a phenotype
what is a genotype
a genotype refers to the combination of alleles an organism has
when is someone
Heterozygous
AND
Homozygous
1) Heterozygous - Both alleles are different
2) Homozygous - Both alleles are the same
