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Mendelian inheritance (or Mendelian genetics or Mendelism) is a set of primary tenets relating to the transmission of hereditary characteristics from parent organisms to their children; it underlies much of genetics. The tenets were initially derived from the work of Gregor Mendel published in 1865 and 1866, which was “re-discovered” in 1900; they were initially very controversial, but they soon became the core of classical genetics.
The laws of inheritance were derived by Gregor Mendel, a 19th century monk conducting hybridization experiments in garden peas (Pisum sativum). Between 1856 and 1863, he cultivated and tested some 28,000 pea plants. From these experiments, he deduced two generalizations that later became known as Mendel’s Laws of Heredity or Mendelian inheritance. He described these laws in a two part paper, “Experiments on Plant Hybridization”, which was published in 1866.
Mendel discovered that by crossing true-breeding white flower and true-breeding purple flower plants, the result was a hybrid offspring. Rather than being a mix of the two colors, the offspring was purple flowered. He then conceived the idea of heredity units, which he called “factors”, one of which is a recessive characteristic and the other dominant. Mendel said that factors, later called genes, normally occur in pairs in ordinary body cells, yet segregate during the formation of sex cells. Each member of the pair becomes part of the separate sex cell. The dominant gene, such as the purple flower in Mendel’s plants, will hide the recessive gene, the white flower. After Mendel self-fertilized the F1 generation and obtained an F2 generation with a 3:1 ratio, he correctly theorized that genes can be paired in three different ways for each trait: AA, aa, and Aa. The capital A represents the dominant factor while the lowercase a represents the recessive.
The answer options (statements) which best describes the law of segregation are: 2 and 3.
Gregor Mendel was a botanist born on the 20th of July, 1822 in Austria.
Mendel's experiment and findings on pea plants are the foundation on which the modern study of genetics is built upon and as such he his famously regarded as the father of genetics.
One of the laws in genetics, which was derived from Mendel's conclusions in the pea plant experiment is the law of segregation.
The law of segregation is a law which states that the two members of a pair of alleles (diploid) separate during gamete production.
Additionally, the law of segregation states that two copies of each gene segregate or separate in order to ensure that each gamete receives only one allele during its development.
In conclusion, the following statements describes the law of segregation:
- All the gametes produced by living organisms with matching alleles for a given trait will have the same allele for that trait.
- If different alleles are present for a given trait in the body cells of a living organism; the dominant allele will receive half of its gametes while the other half will receive the recessive allele.
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