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Heredity and Variation Summary
Summary - The mechanism of transmission of characters from the parental generation to the offspring is called heredity. The differences seen among members of a species and their offspring are described as variations. Genetics is the study of heredity, variations and the environm..
Mendelian Genetics
The biggest name in the entire history of genetics beyond any doubt is that of Gregor Johann Mendel (1822-1884). It was Mendel, more than any other scientist, who synthesized the basic principles of heredity into a body of knowledge that has formed the very core of modern geneti..
Reasons for Mendel's Success
Many scientists earlier to the period of Mendel had attempted breeding experiments in both plants and animals. However, most of them failed to arrive at any specific conclusions or principles to explain the pattern of inheritance. In fact, many of these scientists did not even keep precis..
Mendel's Experiments
>It was possible to conduct cross pollination by transferring pollen grains from one plant to another. Following table represents the contrasting characters, which Mendel was able to identify in the pea plants. fig. 18.6 - Mendel's Monohybrid Traits During his observation on the pattern of inherita..
>It was possible to conduct cross pollination by transferring pollen grains from one plant to another. Following table represents the contrasting characters, which Mendel was able to identify in the pea plants. fig. 18.6 - Mendel's Monohybrid Traits During his observation on the pattern of inherita..Adaptive Radiation
The principle of adaptive radiation is based on two evolutionary mechanisms - convergent and divergent evolutions. Divergent evolution involves the homologous structures. A group of organisms modify a common homologous structure to perform different functions. For example, the modificati..
The principle of adaptive radiation is based on two evolutionary mechanisms - convergent and divergent evolutions. Divergent evolution involves the homologous structures. A group of organisms modify a common homologous structure to perform different functions. For example, the modificati..Monohybrid Inheritance
fig. 18.8 Plants with Axial and Terminal Flowers Similar results were obtained with reference to all the pairs of contrasting characters. Based on these results, Mendel came to the conclusion that in a cross-involving two contrasting characters, only one character expresses itself in the next gener..
Summary
The mechanism of transmission of characters from the parental generation to the offspring is called heredity. The differences seen among members of a species and their offspring are described as variations. Genetics is the study of heredity, variations and the environmen..
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