What is the null hypothesis in Drosophila lab?
Null hypothesis is that there is no statistically significant difference between the observed and expected data. When a heterozygous female wild type is crossed with a yellow body male, the expected phenotypic ratio is 1 wild female:1 wild male:1 yellow body female:1 yellow body male ratio. 6.
What was the conclusion of Drosophila experiment?
He concluded that closer the genes, greater the linkage and vice-versa. Note: He also discovered the white eye mutation in Drosophila. He chooses Droshophila to study the sex-linked genes. The mutation is inherited differently by male and female flies he said.
Why Drosophila is studied?
Drosophila has been used productively as a model organism for over a century to study a diverse range of biological processes including genetics and inheritance, embryonic development, learning, behavior, and aging.
What causes white eyes in Drosophila?
The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive. When a red eyed male mates with white eyed females, their daughters will have red eyes, but their sons will have white eyes.
What are the conclusions drawn by TH Morgan from the crossing experiments in Drosophila with respect to linkage class 12?
Detailed Answer: Based on his experiment, T.H. Morgan concluded that (a) When two genes were situated on the same chromosome, the proportion of parental gene combinations was much higher than the non parental type. This is due to linkage.
Why is it that Drosophila is a good laboratory specimen on chromosomal studies?
D. melanogaster only has four pairs of chromosomes compared to 23 pairs in humans. This simplicity was one of the reasons why they were first used in genetic studies; Drosophila genes could be mapped easily to investigate genetic transmission.
Is TT recessive?
Remember, the recessive phenotype will be expressed only when the dominant allele is absent, or when an individual is homozygous recessive ( tt ) ( Figure below )….
| Genotype | Definition | Example |
|---|---|---|
| Homozygous dominant | Two dominant alleles | TT |
| Homozygous recessive | Two recessive alleles | tt |
How is Drosophila prepared for food?
Warm the water (approximate temperature 35⁰C) and add corn flour. Mix thoroughly to remove any clumps. Add other ingredients (D-Glucose, sugar, agar and yeast powder) and mix again. Close the pressure cooker lid without cooker weight/whistle and keep on high heat for 5 minutes.
What are the conclusions drawn by Morgan from crossing experiment in Drosophila with respect to linkage?
What were the conclusions of Morgan’s experiment conducted with a mutant white eyed male fruit fly?
Morgan began breeding the white-eyed mutant fly and found that in one generation of flies, the trait was only present in males. Through more breeding analysis, Morgan found that the genetic factor controlling eye color in the flies was on the same chromosome that determined sex.