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Questions and Answers
What is the phenotypic ratio when crossing two heterozygous tall pea plants?
What is the phenotypic ratio when crossing two heterozygous tall pea plants?
In Mendel's experiments, what did the F2 generation show when crossing the F1 purple flowered plants?
In Mendel's experiments, what did the F2 generation show when crossing the F1 purple flowered plants?
What does the genotypic ratio 1:2:1 represent in Mendel's experiments?
What does the genotypic ratio 1:2:1 represent in Mendel's experiments?
What is true about dominant genes according to Mendel's experiments?
What is true about dominant genes according to Mendel's experiments?
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How did Mendel ensure pure lines before conducting genetic crosses with pea plants?
How did Mendel ensure pure lines before conducting genetic crosses with pea plants?
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What is the difference between phenotype and genotype in genetics?
What is the difference between phenotype and genotype in genetics?
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What did Mendel observe in the F1 generation when crossing purple flowered plants with white flowered plants?
What did Mendel observe in the F1 generation when crossing purple flowered plants with white flowered plants?
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'Phenotype' in genetics refers to:
'Phenotype' in genetics refers to:
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'Genotypic ratio' refers to:
'Genotypic ratio' refers to:
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Mendel's concept of alleles implies that:
Mendel's concept of alleles implies that:
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Study Notes
- Gregor Mendel's experiments formed the basis of modern genetics by studying pea plants' characteristics such as flower color, plant height, and seed color.
- Mendel crossed purple flowered plants with white flowered plants and observed that all offspring in the first generation (F1) had purple flowers.
- In the F2 generation, obtained by crossing F1 plants, Mendel saw a 3:1 ratio of purple to white flowered plants.
- Mendel explained that certain genes are dominant and always expressed, while others are recessive and only expressed in homozygous form.
- Dominant genes are expressed in both homozygous and heterozygous forms, while recessive genes are expressed only in homozygous form.
- Mendel introduced the concept of alleles (factors) which carry traits from one generation to another, with dominant alleles overpowering recessive ones.
- Mendel ensured pure lines (homozygous for a trait) through inbreeding before conducting genetic crosses to study traits like stem height in pea plants.- Phenotypes are externally observable features, while genotypes are features at the genetic level that cannot be observed.
- Phenotypic ratio is 3:1 when three tall plants and one dwarf plant are observed.
- Genotypic ratio in the example given is 1:2:1 for one homozygous tall plant, two heterozygous tall plants, and one homozygous dwarf plant.
- Phenotype refers to the physical expression of genes giving rise to observable traits, while genotype refers to the genetic makeup of an organism.
- Gregor Mendel conducted crosses studying one character at a time in Monohybrid crosses before moving on to Dihybrid crosses involving two characters.
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Description
Learn about Gregor Mendel's experiments with pea plants and how they laid the foundation of modern genetics. Explore concepts such as dominant and recessive genes, alleles, phenotypes, and genotypes.
