Why was Morgan selected for his 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.
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.
What color eyes do female fruit flies have?
Students sort them into one of four assigned categories: white-eyed females, white-eyed males, red-eyed males, and red-eyed females. Because the eye-color gene is sex-linked, no males will have red eyes (Figure 3).
What is the genotype of a white-eyed female?
Genotypes and phenotypes of offspring if the female is heterozygous. Half of the male and half of the female offspring of a heterozygous female would be white-eyed; the other half would be red-eyed. Therefore the female must be a heterozygous, Xw+ Xw.
Can two normal visioned parents produce a colorblind son?
Colour blindness is a common hereditary (inherited) condition which means it is usually passed down from your parents. Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex.
What happens when a female who is normal marries a man who has hemophilia?
If she gets the X chromosome with the hemophilia gene, she will have hemophilia. A man who has hemophilia and a woman who is a carrier have: a 25% (one in four) chance of having a son with hemophilia. a 25% chance of having a son with normal blood clotting.
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.
Is a gene an enzyme?
Enzymes are just one category of protein. There are many non-enzyme proteins in cells, and these proteins are also encoded by genes. Some genes encode a subunit of a protein, not a whole protein. In general, a gene encodes one polypeptide, meaning one chain of amino acids.
What are the two simple components that make up a virus?
A virus is made up of a core of genetic material, either DNA or RNA, surrounded by a protective coat called a capsid which is made up of protein. Sometimes the capsid is surrounded by an additional spikey coat called the envelope. Viruses are capable of latching onto host cells and getting inside them.
What are the two main principles of Mendelian genetics?
The key principles of Mendelian inheritance are summed up by Mendel’s three laws: the Law of Independent Assortment, Law of Dominance, and Law of Segregation.
On which plants did Mendel do his experiment?
Mendel’s seminal work was accomplished using the garden pea, Pisum sativum, to study inheritance. This species naturally self-fertilizes, meaning that pollen encounters ova within the same flower. The flower petals remain sealed tightly until pollination is completed to prevent the pollination of other plants.
How many factors for every trait must a plant have?
The Law of Segregation Mendel proposed that each pea plant had two hereditary factors for each trait. There were two possibilities for each hereditary factor, such as a purple factor or white factor. One factor is dominant to the other.
What are the 7 characteristics of pea plants?
On the next screen, he reveals that there are seven different traits:
- Pea shape (round or wrinkled)
- Pea color (green or yellow)
- Pod shape (constricted or inflated)
- Pod color (green or yellow)
- Flower color (purple or white)
- Plant size (tall or dwarf)
- Position of flowers (axial or terminal)
What are the three Mendelian laws of inheritance?
The Mendel’s laws of inheritance include law of dominance, law of segregation and law of independent assortment.
What are the four laws of Mendel?
The Mendel’s four postulates and laws of inheritance are: (1) Principles of Paired Factors (2) Principle of Dominance(3) Law of Segregation or Law of Purity of Gametes (Mendel’s First Law of Inheritance) and (4) Law of Independent Assortment (Mendel’s Second Law of Inheritance).