When thomas hunt morgan crossed his red-eyed?

What did Thomas Hunt Morgan discover?

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 observation did Thomas Hunt Morgan make with regard to eye color in female fruit flies in the F2 generation?

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 kind of offspring would you expect from the cross of a black female and an orange male?

What kinds of offspring would you expect from the cross of a black female and an orange male? Tortoiseshell females; black males. Red-green color blindness is a sex-linked recessive trait in humans.

Which of the following is the meaning of the chromosome theory of inheritance is expressed in the early 20th century?

Which of the following statements describes the chromosome theory of inheritance as expressed in the early twentieth century? Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis. It is a gene region present on the Y chromosome that triggers male development.

Why is the White-eyed characteristic more common in males?

No females have white eyes because they received one of their X-chromosomes from their hemizygous dominant, red-eyed father. X-linked recessive phenotypes are more commonly observed in males because males are hemizygous for sex-linked traits.

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.

How did Morgan determine that red eye color?

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.

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 F₁ progeny have red eyes, showing that the allele for white is recessive. Crossing the red–eyed F₁ males and females produces a 3:1 F₂ ratio of red–eyed to white–eyed flies, but all the white–eyed flies are males.

What was the first great discovery?

In other words, there were fixed laws of nature that governed heredity. 04:09 Bill Nye: With this insight Mendel made the first great discovery in the science of genetics: Each inherited characteristic must be decided by a pair of, what he called, factors.

What do we mean when we use the terms Monohybrid Cross and Dihybrid cross?

A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny. A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid cross involves only one.

What is the reason that closely linked genes are typically inherited together?

Linked genes are genes that are likely to be inherited together because they are physically close to one another on the same chromosome. During meiosis, chromosomes are recombined, resulting in gene swaps between homologous chromosomes.

What does a recombination frequency of 50% indicate?

What does a frequency of recombination of 50% indicate? A) The genes are located on sex chromosomes. The two genes are likely to be located on different chromosomes.

When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other the f2generation included both red and white-eyed flies remarkably all the white-eyed flies Weremale What was the explanation for this result?

1) When Thomas Hunt Morgan crossed his red–eyed F1 generation flies to each other, the F2 generation included both red- and white–eyed flies. Remarkably, all the white–eyed flies were male. What was the explanation for this result? A) The gene involved is on the Y chromosome.

Who proposed 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.

Who proposed law of constant chromosome?

The German zoologist Theodor Heinrich Boveri (1862-1915) is usually regarded as one of the proponents of the chromosome hypothesis. It will be shown, however, that his main contribution, from the late 19th century to 1902, was a defense of the constancy in number and individuality of chromosomes.