Upload NowHumans suffer from several genetic disorders, which arise in the following ways: 1. Genetic Disorders Because of Change in Number of Autosomes: a. Down’s Syndrome: Down syndrome occurs because of trisomy 21. This takes place because of nondisjunction during oogenesis. This abnormality occurs in greater incidence in women above 40 years of age. The individual […]
5 Major Genetic Disorders of Humans | Genetics | Biotechnology
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Inheritance in Haploid Organisms (With Diagram) | Genetics | Biotechnology
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Haploid organisms such as protists, fungi and algae have only one gene for a trait and will express the phenotypes of any kind of mutations because there is no hindrance of dominance. On the other hand, diploid organisms such as the Drosophila and pea have two alleles, one in each homologous chromosome. The haploid organisms […]
Deviations from Mendelian Ratio (With Diagram) | Genetics | Biotechnology
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A number of deviations were identified in the post-Mendelian era. The normal monohybrid ratio of 3:1 will occur only when the allele have a relationship of dominance and recesiveness between each other. In the absence of such a relationship, the 3:1 becomes modified variously. Let us understand this with the following examples: 1. Incomplete or […]