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Biology
A Level

Give one piece of evidence that supports the theory that mitochondria evolved from prokaryotic cells.

Mitochondria contain 70S ribosomes (as opposed to 80S which would be found in other eukaryotic organelles) the same as prokaryotic cells. They also have their own DNA (mtDNA) which is separate from the DN...

Answered by Lucy E A. Biology tutor
6581 Views

Colour blindness is a recessive trait caused by an error in the X chromosome. A couple without color blindness are expecting their second child. Their first child was born colour blind. What is the probability of their second child being colour blind?

Colour blindness is recessive, which implies that the child needs to have both chromosomes carrying the genetic error to be born with this condition. We know this is linked to the sex chromosome X so we w...

Answered by Sabela R. Biology tutor
2761 Views

Name two ways in which meiosis produces genetic variation.

Independent segregation (of homologous chromosomes) Crossing over Random assortment

Answered by Daisy L. Biology tutor
6077 Views

Explain how the body responds to a fall in water potential.

Providing there is a basic understanding of the anatomy and functioning of the kidney, we can start by stating that the homeostatic control of osmoregulation in the blood is achieved by h...

Answered by Alexandra S. Biology tutor
11744 Views

Describe how phagocytosis of a virus leads to presentation of its antigens

Firstly, specialised white blood cells, known as macrophages, detect the virus in the blood stream. This is due to the virus releasing chemicals, and in the process of chemotaxis, the macrophage follows t...

Answered by Jennifer L. Biology tutor
2887 Views

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