Top answers

A man has a disease caused by a dominant allele. The mother has the disease but the father does not, explain how we know the man is heterozygous for this disease.

So first we must gather the informaton, the disease is caused by a dominant allele, we may call this 'D', the recessive could therefore be 'd'. The mother has the disease, but the father does not. Therefore ...
LC
Answered by Lucas C. • Biology tutor
3688 Views

How are action potentials generated in a neuron?

A stimulus at the receptor end of the neuron causes the membrane to become more permeable to Na+ ions. Because there is a higher concentration of Na+ on the outside of the cell the flood into the cell down t...
AN
Answered by Alexander N. • Biology tutor
5583 Views

Suggest how the two sub-species have developed from a single ancestral population.

Two populations become separated by a barrier such as sea (geographical separation). As a result populations cannot interbreed, hence gene flow between two populations is prevented. As a consequence, only a ...
MS
Answered by Maja S. • Biology tutor
3565 Views

What is an enzyme?

An enzyme is a catalyst / which speeds up a reaction. It's a protein and/or it's specific (due to its active site)
PE
Answered by Precious E. • Biology tutor
3402 Views

What is the difference between haemodialysis and peritoneal dialysis?

Both are forms of treatment for kidney failure so the blood is left unfiltered as this is one of the main functions of the kidneys. In haemodialysis all of the blood is filtered and it is done externally thr...
VD
Answered by Vaibhi D. • Biology tutor
14424 Views