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Mendel’s First Law (Law of Segregation of Genes | Monohybrid Cross)
Topic Content:
- Mendel’s First Law (Law of Segregation of Genes)
- Describe a monohybrid cross as explained by Mendel’s Law of segregation
What is Mendel’s First Law?
Mendel’s First Law – the Law of Segregation – states that from one parent, only one allelic form of a gene is passed through a gamete to the offspring. The genes are independently transmitted from one generation to another without being altered.
The law of segregation can be demonstrated in a monohybrid cross, where a cross is made between purebred homozygous plants, e.g. one tall (TT) and one short (tt).
- The genotype of all the F1 generation plants is Tt.
- From the figure, all the offspring in the F1 generation are all tall (the dominant trait is T – tall, Hence, the phenotype is all tall plants but they are heterozygous, i.e. not pure breeds.)
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