Section 11–1 The Work of Gregor Mendel (pages –). This section describes how Gregor Mendel studied the inheritance of traits in garden peas and what. Presentation on theme: ” THE WORK OF GREGOR MENDEL”— Presentation transcript: 1 THE WORK OF GREGOR . The answer is segregation!!!. Presentation on theme: “Objectives The Work of Gregor Mendel”— Presentation 12 Answers A trait is a specific characteristic that can vary from one.
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Section The Work of Gregor Mendel
Every wok thing- plant or animal, microbe, or human being — has a set of characteristics inherited from its parents or parent. The scientific study of heredity is genetics.
Gregor Mendel, an Austrian monk, had a very great life studying math and science, teaching high school, and piddling in the monastery gardens. The flowers also have female parts, which produce egg Cells carpel. During sexual reproduction, the male and female cells join, a gregof called fertilization. Fertilization produces a new cell, which develops into a tiny embryo encased within a seed. Pea flowers are normally self-pollinating, which means that sperm cells in pollen fertilize the egg cells in the same flower.
The seeds that are produced inherit all of their characteristics from the ansders plant that bore them.
Section 11.1 The Work of Gregor Mendel
They have a single parent! Mendel discovered that his pea plants were true-breeding, meaning that if they were allowed to self-pollinate, they would asnwers offspring identical to themselves!! One stock of seeds would produce only tall plants, another short ones.
One line produced green answets, another yellow ones. Mendel wanted to produce seeds by joining sperm and eggs from two different plants. To do this he had to prevent self-pollination!!! This is what he did! He cut away the pollen-bearing male parts then dusted pollen from another plant onto the flower. This process 1.1 called cross-pollination. It produced seeds that had two different plants as parents!
This made it possible for Mendel to cross-breed plants with different characteristics, and then study the fascinating results!! Mendel studied seven different pea plant traits. A trait is a specific characteristic that tbe from one individual to another. Mendel crossed plants with contrasting characters and studied their offspring. He called the original set of parents the P parental generation. The offspring of crosses between parents of diff traits are called hybrids.
Mendel was a busy man. He was also surprised Mendel was a busy man! He was also surprised! The character of the other parent seemed to have disappeared!! Or was there another explanation?
Mendel drew two conclusions: Biological inheritance is determined by factors that are passed from one generation to the next. Today, we call the chemical factors that determine traits genes.
Each of the traits Mendel studied was controlled by one gene that occurred in two contrasting forms. These contrasting forms produced the different characters of each trait. The diff forms of a gene are called alleles.
THE WORK OF GREGOR MENDEL – ppt download
An organism with the dominant form of an allele will always exhibit that form of the trait. An organism with the recessive allele for a particular form of a trait will exhibit that form ONLY when the dominant allele for that trait is NOT present!! Mendel wanted to know if the recessive alleles had disappeared, or were they still present in the F1 plants??
He allowed all seven kinds of F1 hybrid plants to produce an F2 2nd filial generation by self-pollination. When Mendel compared the F2 plants, he discovered that the traits controlled by the recessive alleles had reappeared!! WHY did the recessive alleles seem to disappear in one generation and reappear in the next??? The answer is segregation!!! The reappearance of the recessive trait short plant in this case indicated that it had somehow become separated from the allele for tallness.
Mendel suggested that the alleles for tallness and shortness in the F1 plants segregated from each other during the formation of the sex cells, or gametes. If F1 plants inherit an allele for tallness from one parent and an allele for shortness from another parent, all the F1 plants are tall because the allele for tallness is dominant.
Therefore, each F1 plant produces two types of gametes those with the allele for tallness and those with the allele for shortness. K in Revolutionized the study of genetics. The scientific study of heredity Heredity is the passing on of traits from parent to offspring. My presentations Profile Feedback Log out. Auth with social network: Registration Forgot your password?
The Work of Gregor Mendel. Introduction to Genetics California content standards: Genetics 2c, d, g; 3a, b.
Revolutionized the study of genetics. OK Do Now What is an inheritance? Something passed from one generation to the next.