2da Ley de Mendel - Ley de la Segregación

Introduction to Mendelian Genetics

In this section, the speaker introduces the concept of Mendelian genetics and explains how an individual's traits are determined by their genes.

The Law of Mendel

• According to the Law of Mendel, an individual is heterozygous if they possess two different alleles for a particular trait.

• The dominant allele is represented by a capital letter (A), while the recessive allele is represented by a lowercase letter (a).

Gamete Formation and Allele Combinations

• Gametes are formed in each individual, which can contain either the dominant or recessive allele.

• The characteristic A determines orange color in peas, while a determines yellow color.

• When two individuals with different alleles mate, there are four possible combinations of alleles that can be produced.

Punnett Squares and Crossbreeding

• Punnett squares can be used to determine the possible offspring from crossbreeding between two individuals.

• Offspring inherit one gene from each parent, which can be either double dominant (AA), double recessive (aa), or heterozygous (Aa).

• An example of crossbreeding pea plants resulted in 25% of offspring being yellow despite both parents having orange color.

Conclusion

Mendelian genetics provides insight into how traits are passed down from generation to generation through genes. By understanding how alleles combine during gamete formation and crossbreeding, we can predict the likelihood of certain traits appearing in offspring.