Family is a cultural, legal, sociological and individually defined concept. It is fundamental social group typically include what is referred to as a nuclear family – father, mother and one or more children. Other definition of a family includes all the members of a household living under one roof. Families can also be defined by the ways person behave toward one another or how relationship function in the lives of people.

Friday, March 30, 2018

Law of Segregation of genes (First Law) by Gregor Mendel

Segregation is the key theoretical assumption of Mendelian genetics. The first law of Mendelian genetics is the law of segregation. The law of segregation is also called 'Mendel's first law'.

The explanation of Mendel's First Law is provided by meiosis, although of course Mendel himself knew nothing of this process. The segregation of alleles in inheritance corresponds to the segregation of homologous chromosomes in meiosis.

The law of segregation states that traits are expressed from a pair of genes in the individual (on homologous chromosomes). Each parent provides one chromosome of every pair of homologous chromosomes.

Paired chromosomes (and thus corresponding genes) separate and randomly recombine during gamete formation. These characteristics are controlled by pairs of genes that segregate or separate during the formation of the reproductive cells, thus passing into different gametes.

The pairs are restored when fertilization occurs, and this leads to the production of different types of offspring in certain definite proportions. In effect, segregation shuffles the genes and redeals them to the next generation.
Law of Segregation of genes (First Law) by Gregor Mendel
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