Principles of Inheritance and Variation
ICSE · Class 12 · Biology
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The plant used by Mendel for his genetic experiments was:
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Pisum sativum
Mendel used Pisum sativum (garden pea) for his genetics experiments, studying 7 pairs of contrasting traits over 8 years.
In a monohybrid cross, the F2 phenotypic ratio is:
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3:1
In a monohybrid cross, the F2 generation shows a 3:1 phenotypic ratio (3 dominant : 1 recessive). The genotypic ratio is 1:2:1.
The F2 phenotypic ratio in a dihybrid cross is:
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9:3:3:1
In a dihybrid cross (two independent traits), the F2 phenotypic ratio is 9:3:3:1, demonstrating Mendel's Law of Independent Assortment.
Mendel's Law of Segregation states that:
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The two alleles of a gene separate during gamete formation
The Law of Segregation (Purity of Gametes) states that the two alleles of a gene separate during meiosis, so each gamete carries only one allele.
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