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 did Thomas Hunt Morgan discover about DNA?
He showed
that genes are linked in a series on chromosomes
and are responsible for identifiable, hereditary traits. Morgan's work played a key role in establishing the field of genetics. He received the Nobel Prize for Physiology or Medicine in 1933.
What did the 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
. Morgan received his Ph.
What is Morgan theory?
By painstakingly examining thousands upon thousands of flies with a microscope and a magnifying glass, Morgan and his colleagues confirmed
the chromosomal theory of inheritance
: that genes are located on chromosomes like beads on a string, and that some genes are linked (meaning they are on the same chromosome and …
How did Morgan explain his findings?
How did Morgan explain his finding?
Linked genes were inherited together because
they were close to each other on the same chromosome. … The farther apart two genes were on a chromosome, the more likely it would be that crossing-over would occur between them.
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 animal did Morgan experiment on?
In Morgan's experiments on linkage, the parental types
red eyed, normal wings and white eyed, miniature wings
which were used for test-cross.
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 are white-eyed female fruit flies so rare in nature?
White eyes are very rare in natural fruit fly populations. … Morgan realized that in these
flies, eye color must somehow be tied to sex
. From this and other evidence, Morgan deduced that the gene involved in this inheritance pattern is located only on the X chromosome. There is no corresponding eye color locus on the Y.
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
.
Who is the father of linkage?
In the early 1900s,
William Bateson
and R. C. Punnett were studying inheritance in the sweet pea.
Where did Thomas Hunt Morgan do his genetic work?
| Thomas Hunt Morgan ForMemRS | Fields Genetics Embryology | Institutions Bryn Mawr College Columbia University California Institute of Technology |
|---|
What was the most likely conclusion of Morgan's research?
What was the most likely conclusion of Morgan's research?
The pigment in butterfly wings absorbs light from the environment
. The phenotypic expression of wing shape depends on color pigmentation in butterflies. The genes regulating wing color in butterflies are influenced by environmental factors.
Are alleles DNA?
Except in some viruses, genes are made up of DNA, a complex molecule that codes genetic information for the transmission of inherited traits. Alleles are also genetic sequences, and they too code for the transmission of traits. … The short answer is that
an allele is a variant form of a gene
.
Who verified chromosomal theory of inheritance?
The chromosome theory of inheritance is credited to papers by
Walter Sutton in 1902 and 1903
, as well as to independent work by Theodor Boveri during roughly the same period. Boveri was studying sea urchins, in which he found that all the chromosomes had to be present for proper embryonic development to take place.
