Top answers

Biology
GCSE

Janice has cystic fibrosis. Cystic fibrosis is caused by a recessive allele (f). What is the probability of her baby having cystic fibrosis? The baby’s father is heterozygous for cystic fibrosis.

Answer = 50% chance of developing cystic fibrosis 

VP
Answered by Vishal P. Biology tutor
4170 Views

Can you explain what the stages of a reflex action are; for example what actually happens when you touch a hot object?

Firstly, the whole point of a reflex is to create a QUICK reaction to a STIMULUS. So, the first stage of a reflex is SENSATION - i.e when you first touch the hot object the receptors in the skin will sens...

KP
Answered by Kinari P. Biology tutor
10297 Views

Describe ways in which the body prevents entry of microorganisms

The first line of defence is the skin. This forms a physical barrier that prevents any microorganisms from getting into the body. Acid in the stomach, due to the low pH, is another defence the body has. T...

AC
Answered by Adrian C. Biology tutor
17387 Views

What is the difference between aerobic and anaerobic respiration?

Aerobic respiration needs oxygen. It is the release of a relatively large amount of energy in cells by the breakdown of food substances in the presence of oxygen:

glucose + oxygen ...

DH
Answered by Dan H. Biology tutor
3516 Views

How is information transmitted across a chemical synapse?

By neurotransmitters. At a neuromuscular junction, the neurotransmitter is Acetylcholine released from vesicles in the pre-synaptic neurone. Receptors on the muscle cell surface bind acetylcholine in the ...

UO
Answered by Uchenna O. Biology tutor
2554 Views

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