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Biology
Module 6
6.1.2 Patterns of inheritance
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Zubaidah Rauf
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Cards (13)
Genotype
- Genetic constitution of an organisms (the alleles it has for a gene).
Phenotype
- The expression of the genes and its interaction with the environment.
Homozygous
- Pair of homologous chromosomes carrying the same alleles for a single gene.
Heterozygous
- A pair of homologous chromosomes carrying two different alleles for a single gene.
Recessive allele
- An allele only expressed if no dominant allele is present.
Dominant
allele - An allele that will always be expressed in the phenotype.
Codominant
- Both alleles are equally dominant and expressed in the phenotype.
Multiple alleles
- More than two alleles for a single gene.
Sex-linkage
- A gene whose locus is on the X chromosome.
Autosomal linkage
- Genes that are located on the same chromosome (not the sex-chromosomes).
Epistasis
- When one gene modifies or masks the expression of a different gene at a different locus.
Monohybrid
- Genetic inheritance cross of a characteristic is determined by one gene.
Dihybrid
- Genetic inheritance cross for a characteristic is determined by two genes.