When Thomas Hunt Morgan mated a white-eyed male fly with a red-eyed female, he came to the startling conclusion that the trait for eye color was located on the chromosome that determines sex . ... F2 generation: The offspring showed a ratio of three red-eyed flies to one white- eyed fly.
What observation did Thomas Hunt Morgan make with regard to eye color in female fruit flies in the F2 generation?
Thomas Hunt Morgan, who studied fruit flies, provided the first strong confirmation of the chromosome theory. Morgan discovered a mutation that affected fly eye color . He observed that the mutation was inherited differently by male and female flies.
What results did Thomas Hunt Morgan get when he crossed a white eyed female fly with a red eyed male fly?
“Sex Limited Inheritance in Drosophila” (1910), by Thomas Hunt Morgan. ... 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 did Thomas Hunt Morgan discover in his experiments with fruit flies?
4, 1945, Pasadena, Calif.), American zoologist and geneticist, famous for his experimental research with the fruit fly (Drosophila) by which he established the chromosome theory of heredity . He showed that genes are linked in a series on chromosomes and are responsible for identifiable, hereditary traits.
What did Thomas Hunt Morgan discover?
Thomas Hunt Morgan was awarded the Nobel Prize in Physiology or Medicine in 1933. The work for which the prize was awarded was completed over a 17-year period at Columbia University, commencing in 1910 with his discovery of the white-eyed mutation in the fruit fly, Drosophila .
Why does crossing over unlink genes?
Crossing over can put new alleles together in combination on the same chromosome, causing them to go into the same gamete. When genes are far apart, crossing over happens often enough that all types of gametes are produced with 25% frequency.
Why do human females show a Barr body in their cells?
A Barr Body is an inactivated, condensed X chromosome found in female cells. Since females possess two X chromosomes and males have one X chromosome and a Y chromosomes, Barr bodies are essential to regulate the amount of X-linked gene product being transcribed .
Why were all the white-eyed flies male?
Most of the white-eyed flies were male. ... Morgan hypothesized that, in his breeding experiment, the first generation of flies contained males only with white eyes because the gene controlling eye color was on the X chromosome . Males displayed the white eye trait because the trait was present on their only X chromosome.
Can female flies have white eyes?
All of the females and all of the males will have red eyes. All of the females will have white eyes ; half of the males will have red eyes, and half of the males will have white eyes.
What was the gender of all of the white-eyed flies?
What was the gender of all of the white-eyed flies? Although the first generation of 1,237 offspring was all red-eyed but for three, white-eyed flies appeared in larger numbers in the second generation. Surprisingly, all white-eyed flies were male .
Why did Hunt Morgan use fruit flies?
Thomas Hunt Morgan, an embryologist who had turned to research in heredity, in 1907 began to extensively breed the common fruit fly, Drosophila melanogaster. He hoped to discover large-scale mutations that would represent the emergence of new species. ... He isolated this specimen and mated it to an ordinary red-eyed fly.
What did Thomas Morgan conclude?
Morgan’s conclusion—that the white-eye trait followed patterns of sex chromosome inheritance —was at once very specific and very grand. A few years prior to these test crosses, Mendelian ideas of inheritance had been enthusiastically discussed by many researchers in the context of new findings about chromosomes.
What are the phenotypic ratios of a white eyed female is crossed with a red-eyed male?
When white-eyed males are crossed with red-eyed females, all the F 1 progeny have red eyes, showing that the allele for white is recessive. Crossing the red-eyed F 1 males and females produces a 3:1 F 2 ratio of red-eyed to white-eyed flies, but all the white-eyed flies are males.
Is white eyed Drosophila recessive?
The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive .
Is th Morgan father of modern genetics?
father of modern genetics is Bateson. and father of experimental genetics is Morgan . Father of modern genetis is Mendel. Bateson gave the term genetics to Mendelian experiment.
Who is the father of linkage?
In the early 1900s, William Bateson and R. C. Punnett were studying inheritance in the sweet pea.
