Drosophila Ausomal and Sex-Linked Cross

His second theory is an independent taxonomy that happened in the medium term I. This theory is based on the fact that in the F 2 generation there is a new phenotypic ratio of two-hybridization (9: 3: 3: 1). Here, alleles (genes) are expected to be isolated independently of each other (Cain, Urry, & Reece, 2010). Thomas Hunter Morgan continued Mendel's work and decided to try Drosophila called Drosophila in 1911. He studied them because they have only four chromosomes, three of which are autosomal and one of which are sex chromosomes.

As mentioned above, Drosophila inherits sex chromosomes in the same way as humans. Traits controlled by genes located on the sex chromosome are called sexual linkage traits. Alleles of sexually relevant traits are written using superscripts of X or Y chromosomes. Since the X and Y chromosomes are not homologous, the Y chromosome has no allele corresponding to the chromosome on the X chromosome and superscripts are not used. In addition, any recessive allele on the male X chromosome will not be hidden by the corresponding dominant allele on the Y chromosome. Thomas Hunt Morgan found a function related to sex chromosome. One day Morgan discovered that fly had white eyes instead of regular red eyes. A woman with red eyes passed through a man with white eyes. All F1 descendants have red eyes and indicate that the characteristics of the white eyes are recessive. Then Morgan copulates F1 flies among them.

American geneticologist Morgan studied genetic laws using D. melanogaster in breeding experiments. He is very interested in the change in inheritance characteristics. He and his team examined the cross between red-eye and white-eyed fruit fly and discovered that descendants can not be explained by the proportion of Mendel. This led to the discovery of his sexually relevant genetics and he found crossover (or chromosomal recombination) in which the majority of the nucleotides on the homologous chromosome are exchanged)

The purpose of this experiment was to investigate the inheritance of sexual linkage genes in lozenges and white eyes of Drosophila melanogaster in pure white diamond male samples and to investigate the influence of chain distance on allelic classification. During meiosis, in three generations of Drosophila melanogaster. This is done by comparing the predicted and actual values ​​of these alleles. Drosophila melanogaster is widely used in genetic studies. Some of the reasons why Drosophila is so popular in genetic research are that they are very small and easy to grow in the laboratory. They have a short life cycle and produce new generation fruit flies every two weeks. Female fruit flies can produce hundreds of fertilized eggs during their short life span.