Eukaryotic organism such as drosophila have been used extensively to demonstrate the classical Mendelian laws because they are inexpensive and abundant in genetic variations due to a small number of chromosomes. The purpose of this lab was to determine the phenotypic ratio for monohybrid and dihybrid crosses using drosophila. In a monohybrid cross, a single trait (eye color) is crossed in the organism and in a dihybrid cross,two different traits (eye color and wings) are crossed for a particular organism (drosophila). For this lab, we were determining if the results of our monohybrid cross follows the mendelian law of equal segregation which says that a gamete receives only one copy of gene from the parent. And that the dihybrid cross demonstrates Mendel’s law of
…show more content…
Females are usually larger than males. The caudal extremity of the female is sharp and protruding while that of the male is round and blunt. Black pigment or color of the caudal extremity of the male is more extensive and that of the female occurs only in the dorsal region. Males have black bristles (sex combs) on each of the front legs, but females have none. The wild type drosophila has red eyes, long normal wings, and gray in color. The mutant type drosophila has white or sepia eye, vestigial or apterous wings, and ebony body color. (Morgan, 1910) For the monohybrid cross, we were trying to determine if eye color was sex linked inherited so we proposed that males should have more white eyes than females. And for the dihybrid cross, we were trying to determine if the phenotypic ratio of 9:3:3:1 was observed for the two traits (wing size and eye color). We predicted that both crosses should follow the classical Mendelian laws of equal segregation and independent
Females are usually larger than males. The caudal extremity of the female is sharp and protruding while that of the male is round and blunt. Black pigment or color of the caudal extremity of the male is more extensive and that of the female occurs only in the dorsal region. Males have black bristles (sex combs) on each of the front legs, but females have none. The wild type drosophila has red eyes, long normal wings, and gray in color. The mutant type drosophila has white or sepia eye, vestigial or apterous wings, and ebony body color. (Morgan, 1910) For the monohybrid cross, we were trying to determine if eye color was sex linked inherited so we proposed that males should have more white eyes than females. And for the dihybrid cross, we were trying to determine if the phenotypic ratio of 9:3:3:1 was observed for the two traits (wing size and eye color). We predicted that both crosses should follow the classical Mendelian laws of equal segregation and independent