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CONCLUSION
A Monohybrid cross is a cross between one trait in which one is dominant and recessive. The parents of the Drosophila melanogaster offspring were of the First Filial Generation, and were Heterozygous Dominant. In the cross, the red-eyed trait is dominant over the recessive sepia-eyed trait, and results in a 1 phenotypic ratio of red-eyed flies to sepia-eyed as shown in the Punnett square. This cross agrees with Mendel's Law of Dominance.
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A Dihybrid cross is a cross between two traits. The parents of the Drosophila melanogaster offspring were Heterozygous dominant. In the cross, red-eyes and normal wings are dominant over the sepia-eyes and vestigial wings, and results in a 1 ratio of red-eyes/normal wings to red-eyes/vestigial wings to sepia-eyes/normal wings to sepia-eyes/vestigial wings. The dihybrid cross agrees with Mendel's Law of Independent Assortment, where each allele of any one pair is free to combine with any allele from each of the remaining pairs during the formation of the gametes
Most chromosome pairs consist of homologous or identical partners. One pair of chromosomes, which noticeably differ from one another are called the sex chromosomes. They are called the sex chromosome because they determine the differences between males and females. Genes located on the sex chromosomes show different patterns of inheritance than genes located on other chromosomes. With Drosophila melanogaster, the red or white eye color is a sex-linked trait. The trait for eye color is carried on the X chromosome, and therefore the sex-linked cross violates Mendel's Law of Independent Assortment. The phenotypic ratio for a sex-linked cross is a 1111 ratio, where the amount of red and white-eyed flies is equal.
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