![]() Since this particular gene that controls eye color is on the X-chromosome, females (XX) carry two copies, and males (XY) only carry one. Select one male and one female individual for the P 1 generation and click 'begin' to explore eye color inheritance patterns in fruit flies: However, the gene is on the X-chromosome, making it an excellent illustration of sex-linked inheritance patterns. If the white gene were on an autosome, it would exhibit classical Mendelian inheritance patterns. As a recessive trait, the white eye phenotype is masked by the presence of a wild-type (red encoding) allele. Wild-type fruit flies have dark red eyes, but there are recessive alleles of this eye color gene (called the white gene) that cause individuals to have white eyes. The X-chromosome is larger and contains more genes than the Y-chromosome, so most sex-linked traits are X-linked traits. These patterns cause expression patterns of sex-linked traits to differ between male and female offspring. In other words, their phenotypes always match their genotype *s.įemales get two copies of X-linked genes, demonstrating the more typical dominant-recessive expression patterns of non-sex linked traits. ![]() Since males have only one copy of each sex chromosome, they are hemizygous for all sex-linked genes, and they always express the phenotype * of the allele * they get. With both an X and a Y-chromosome, males inherit both X and Y-linked traits, while females only inherit X-linked traits. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |