What results did Thomas Hunt Morgan get when he crossed a white eyed female fly with a red eyed male fly?
That year, Morgan was breeding Drosophila, or fruit flies. After observing thousands of fruit fly offspring with red eyes, he obtained one that had white eyes. Morgan began breeding the white-eyed mutant fly and found that in one generation of flies, the trait was only present in males.
What was the result when Morgan mated fruit flies with the genotypes XrXr and XrY?
if Morgan crossed XrXr and XrY, a white-eyed female and a white flied male, it will produce 2 XrXr(white-eyed female fly) and 2 XrY(white-eyed male fly).
What conclusion did Morgan draw after breeding populations of fruit flies where only males had white eyes?
Morgan discovered a mutation that affected fly eye color. He observed that the mutation was inherited differently by male and female flies. Based on the inheritance pattern, Morgan concluded that the eye color gene must be located on the X chromosome.
What did Morgan discover using the fruit fly Drosophila?
In brief, Morgan had discovered that eye color in Drosophila expressed a sex-linked trait. All first-generation offspring of a mutant white-eyed male and a normal red-eyed female would have red eyes because every chromosome pair would contain at least one copy of the X chromosome with the dominant trait.
Why has TH Morgan selected fruit flies for his genetic experiment?
T. H. Morgan selected Drosophila melanogaster to study sex-linked genes in his lab experiment due to the following reasons: (ii) Sex-linked traits such as red eye colour and white eye colour are found only in Drosophila ​melanogaster, where white eye colour in males is a sex-linked recessive trait.
How do you tell the difference between a male and female Drosophila?
Male Drosophila are generally smaller than their female counterparts, and have a darker abdomen. The posterior segments of the Drosophila female are only pigmented in their posterior halves, whereas these segments are almost completely pigmented in the males.
Are all flies female?
Fly genders mirror those of more advanced species. When they mate, the males introduce sperm into female bodies, and females develop and lay eggs to create the next generation of flies.
How does the fruit fly larvae increase its size?
Most of this nutrition-dependent increase in larval mass is contributed by an increase in the size of polyploid cells (i.e. cells containing multiple copies of the normal haploid set of chromosomes) that make up the bulk of the larval tissues, such as muscle, fat body, gut, epidermis and salivary gland.
What is the life span of a fruit fly?
40 to 50 days
What does a fruit fly eggs look like?
Fruit fly eggs measure only 1/2 mm in length. Under a microscope, they are yellow in color and appear to be the shape of a grain of rice. In optimal temperatures, fruit fly eggs hatch into larvae within 30 hours. These larvae ultimately mature into adults that feed, breed and lay their own generation of eggs.