Heredity. Ronak Ahmed Duhok International School 2012-2013. Chapter 1 / Section 1. Mandel and the Pea Plants. What is the meaning of Heredity?. The passing of genetic traits from parent to offspring. straight hair. Curly hair. Black eyes. Brown eyes. Gregor Mendel.
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Duhok International School
Mandel and the Pea Plants
The passing of genetic traits from parent to offspring.
Born in 1822 in Heinzendorf, Austria.
when he was 21st Years old, he was sent to Vienna for receiving training in teaching.
He discovered the principles of heredity when he did his research on pea plant.
During his working with plants, he knew that the patterns of inheritance were not always clear.
Many different kinds available.
Able to self- pollinate.
What is the self pollinate?
A self-pollinating plants has both male & female reproductive structures. So, pollen from one flower can fertilize the ovule of the same flower or the ovule of another flower on the same plant.
Because eggs (in an ovule) and sperm (in pollen) from the same plant combine to make a new plant, Mendel was able to grow true-breeding plants.
Why is it important that pea plants can self-pollinate?
All of its offspring will have the same trait as the parent.
Pollen from one plant fertilizes the ovule of a flower on a different plant
The carrying of pollen is done by several ways:
1- By insect
2- By wind
3- By water
Characteristic : is a feature that has different forms in a population.
2. He used pollen from another plant to fertilize the plant.
This step allowed Mendel to select which plants would be crossed to produce offspring.
Dominant trait: The trait observed in the first generation when parents that have different traits are bred.
In his second experiments, he allowed the first generation plants, which resulted from his first set of experiments, to self pollinate.
The recessive trait for white flowers is reappeared