Genetics Part 1

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Mrs. K explains simple genetics and Punnett squares, including the terms dominant, recessive, homozygous, heterozygous, genotype, phenotype, and test cross.

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The Aakash iTutor video starts with genetics which is a branch of science that deals with the study of heredity and variations. The term genetics was given by Bateson. Father of genetics is Gregor Mendel. The video talks about premendelian, mendelian experiments and postmendelian concepts of heredity.

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18 Things You Should Know About Genetics is an animated film that presents fundamental background information about genetics, as well as offering some quirky but interesting facts about DNA, genes and genetics. It was created to be an upbeat, fun educational short film to initiate and draw interest to this sometimes daunting and seemingly complex subject matter.

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Malvika Choudhary in this video tutorial explains the concept of life, characteristics of living world and differentiating it from non-living world.
She then explains the classification and rules for nomenclature along with mnemonics, finally the taxonomic categories and tools for study of taxonomy.


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Help with basic genetics problems, including the use of the Punnett square and rules of probability to solve monohybrid, dihybrid and even - wait for it - YES, the dreaded trihybrid cross! Unions and intersections, autosomal dominant, autosomal recessive and even X-linked recessive inheritance... plus even some relationship advice on the side. All in one video? You bet!

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This HD dramatic video choreographed to powerful music introduces the viewer/student to the science of Genetics and Inheritance. It is designed as a motivational trailer to be shown in classrooms by Biology teachers in middle school, high school and college as a visual Introduction to the history and science of Genetics, Heredity and Biotechnology.

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Malvika Choudhary explains the fundamentals of genetics and three laws of Mendelian inheritance.
1. Law of Dominance
2. Law of Segregation
3. Law of Independent Assortment
Malvika explains the various terminologies like monohybrid cross, dihybrid cross, homologous, heterologous, dominant and recessive in this video.


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Linked genes are used as markers. Gene mapping is a technique to locate the genes on a chromosome

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Important terms which are used to study inheritance of characters

This is my video about OCR A2 Biology F215 on Genetics. Please, like, subscribe or leave comments and feedback and if you want to ask me anything or give me personal feedback email me at [email protected] As many people are messaging me for questions at the moment in many different areas (many of which I don't really check as much) and because I've had a few people ask for a general place to ask questions I have created a student room thread. Feel free to ask questions here:

How to solve genetic questions in NEET and CLASS.

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Class 12 Biology – Principle of Inheritance and Variation
Ever wondered why people say that you look somewhat like your mother or your father? Why some features give away your identity? This ‘inheritance’ which you get from your parents or grandparents, is related to your genes. Your genes contain certain information which came along to you from your forefathers. We’ll learn about this in detail in this chapter. We’ll learn
1. What is inheritance and variation?
2. Experimental approach by Mendel.
3. Inheritance of one gene.
4. Punnett Square.
5. Laws of Inheritance.
6. Inheritance of 2 genes.
7. Chromosomal Theory of Inheritance.
8. Linkage.
9. Sex Determination.
10. Mutations.
11. Pedigree Analysis.
12. Sex linked Disorders.
13. Chromosomal Disorders.

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In this Video Lecture Professor Fink provides a simple description of genetic concepts first using the trait of Eye Color & a Punnett Square, and then describing the transmission of most Genetic Diseases using a Punnett Square. Reference is made to dominant genes, recessive genes, the Genotype, homozygous, heterozygous, the Phenotype, alleles, Genotypic Ratio, Phenotypic Ratio, Carrier and the use of a Pedigree Chart.
Professor Fink then describes the characteristics of Benign versus Malignant Tumors (Cancer) and the 4 Major Theories related to the Causes of Cancer. Reference is made to oncogenes, metastasis, transformation, Genetic Factors (BRCA & p-53), Mutagenic (Carcinogenic) Factors, Non-Lytic (Lysogenic viruses; Human Papilloma Virus; HPV), and the role of the Immune System.

Check-out professor fink's web-site for additional resources in Biology, Anatomy, Physiology & Pharmacology: professorfink.com

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Paul Andersen shows you how to use the rules of multiplication and addition to correctly solve genetics problems. The rule of multiplication can be applied to independent events in sequence. The rule of addition can be applied to mutually exclusive events.

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This genetics lecture explains How to solve genetics probability problems with simpler and easy tricks and this video also explains when to use addition or multiplication rule to solve probability problems in genetics.
So watch this video lecture to learn how to solve genetics problems with probability and risk calculations using addition and multiplication rule.
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Paul Andersen reviews the major concepts within the fifth unit of the new AP Biology framework. He starts with a description of both DNA and RNA. He explains how DNA is copied during the S phase of mitosis. He explains how transcription produces a strand of mRNA that is translated at the ribosome into a polypeptide. He compares and contrasts mitosis and meiosis and differentiates between haploid and diploid cells. He finally discusses Mendelian and chromosomal genetics. He finishes the podcast with a discussing of operons and transcription factors.

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Greatest discoveries with bill Nye will take you to a new way into the world of Genetics. Learn all subtleties and a great start with Professor bill Nye.

Genetics : is the branch of science which deals with Heredity and Variation.

Heredity: is the transfer of characters from one generation to other generation.

Variation: is described as the changes imbibed in the offspring (children) and siblings (brothers and sisters) of a Biparental (Male and Female) sexual reproduction.

Pre-mendelian views:

 Moist vapours theory by Pythagoras (580-500 B.C) – different part of the body produces moist vapors which take part in the formation of embryo parts.
 Fluid theory by Impedances (504-533 B.C) and reproductive blood theory by Aristotle (384 – 322 B.C)
 Preformation theory – Malpighi (1673) believed that homunculus or miniature individual is present in sperm of egg.
 Theory of pangenesis by Darwin which believes that every cell of the body produces a gem mule of pan gene that contains both parental and acquired characters . The gem mules passes eats gametes and hence into embryo.
 Premendelian theories were also called as theories of blending inheritance because they believed that traits of the two parents got blended in the offspring.

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Mendelian inheritance was initially derived from the work of Gregor Johann Mendel published in 1865 and 1866 which was re-discovered in 1900. It was initially very controversial. When Mendel's theories were integrated with the Chromosome Theory of Inheritance by Thomas Hunt Morgan in 1915, they became the core of classical genetics.
The laws of inheritance were derived by Gregor Mendel, a nineteenth-century Austrian monk conducting hybridization experiments in garden peas (Pisum sativum).[1] Between 1856 and 1863, he cultivated and tested some 5,000 pea plants. From these experiments, he deduced two generalizations which later became known as Mendel's Principles of Heredity or Mendelian inheritance. He described these principles in a two-part paper, Experiments on Plant Hybridization, that he read to the Natural History Society of Brno on February 8 and March 8, 1865, and which was published in 1866.[2]

Mendel's conclusions were largely ignored. Although they were not completely unknown to biologists of the time, they were not seen as generally applicable, even by Mendel himself, who thought they only applied to certain categories of species or traits. A major block to understanding their significance was the importance attached by 19th-century biologists to the apparent blending of inherited traits in the overall appearance of the progeny, now known to be due to multigene interactions, in contrast to the organ-specific binary characters studied by Mendel.[1] In 1900, however, his work was re-discovered by three European scientists, Hugo de Vries, Carl Correns, and Erich von Tschermak. The exact nature of the re-discovery has been somewhat debated: De Vries published first on the subject, mentioning Mendel in a footnote, while Correns pointed out Mendel's priority after having read De Vries's paper and realizing that he himself did not have priority. De Vries may not have acknowledged truthfully how much of his knowledge of the laws came from his own work, or came only after reading Mendel's paper. Later scholars have accused Von Tschermak of not truly understanding the results at all.[1]

Regardless, the re-discovery made Mendelism an important but controversial theory. Its most vigorous promoter in Europe was William Bateson, who coined the terms genetics and allele to describe many of its tenets. The model of heredity was highly contested by other biologists because it implied that heredity was discontinuous, in opposition to the apparently continuous variation observable for many traits. Many biologists also dismissed the theory because they were not sure it would apply to all species. However, later work by biologists and statisticians such as R. A. Fisher showed that if multiple Mendelian factors were involved in the expression of an individual trait, they could produce the diverse results observed. Thomas Hunt Morgan and his assistants later integrated the theoretical model of Mendel with the chromosome theory of inheritance, in which the chromosomes of cells were thought to hold the actual hereditary material, and created what is now known as classical genetics, which was extremely successful and cemented Mendel's place in history.

Mendel's findings allowed other scientists to predict the expression of traits on the basis of mathematical probabilities. A large contribution to Mendel's success can be traced to his decision to start his crosses only with plants he demonstrated were true-breeding. He also only measured absolute (binary) characteristics, such as color, shape, and position of the offspring, rather than quantitative characteristics. He expressed his results numerically and subjected them to statistical analysis. His method of data analysis and his large sample size gave credibility to his data. He also had the foresight to follow several successive generations (f2, f3) of pea plants and record their variations. Finally, he performed test crosses (back-crossing descendants of the initial hybridization to the initial true-breeding lines) to reveal the presence and proportion of recessive characters. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
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