<u>Staphylococcus</u> <u>aureus</u> is a pathogen that can contaminate food if a food service worker sneezes on the food.
What is Staphylococcus aureus?
Staphylococcus aureus is a bacterium which is highly tolerant to salt, and can easily grow on food materials like meat, milk products etc.
Role in disease:
- S. aureus is found generally in soil, air and water. Research says it can also be found in nose, skin and other areas of human beings.
- Any food contaminated with this bacterium, can become toxic for consumption because the bacteria can easily multiply in the food, release toxin that can cause illness.
- Major illness caused by Staphylococcus aureus include Pneumonia, sepsis, toxic shock syndrome etc.
To learn more about Staphylococcus aureus, refer:
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Cold air damming is a meteorological phenomenon that involves a high-pressure system accelerating the process
Answer:
Genotype of long winged fly is Ll
Genotype of short winged fly is ll
Explanation:
Given
Allele for long wing trait is "L"
Allele for short wing trait is "l"
When a long winged fly is crossed with a short winged fly, half of the offspring have long wings and other half have short wings as the ratio is 
Let us say that the genotype of long winged fly is Ll
and the genotype of short winged fly is ll
The cross between the two will produce following offspring
Ll * ll
Ll, Ll, ll, ll
Out of four off spring two have long wings (Ll)
and the other two have short wings (ll)
Thus the ration of long to short wing offspring is
i.e 