BRAINCAKEMonohybrid Crosses
A monohybrid cross follows the inheritance of one characteristic controlled by a single gene with two alleles.
A genetic diagram is set out in steps: parental phenotypes, parental genotypes, gametes, offspring genotypes (usually in a Punnett square), offspring phenotypes and the ratio.
Worked example: in pea plants, the allele for tall (T) is dominant to the allele for short (t). A homozygous tall plant is crossed with a short plant.
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Key terms in this lesson
- punnett square
- A diagram, in the form of a grid, used to work out the genotypes and phenotypes of offspring from a genetic cross.
More in Genetic Information
- Random Fertilisation
- Genetics and Inheritance
- Alleles
- Polygenic Traits
- Test Cross
- Sampling Errors
- Mendel
- Law of Segregation
All 30 lessons in Genetic Information · All Edexcel A-level Biology topics