Search our library of Biology questions

Top answers

Biology

All levels

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

Answered by Vishal P. • Biology tutor

3772 Views

Outline the Stages of Mitosis

Pre-Mitosis:

Interphase:

- DNA as uncondensed chromatin

- DNA contained within nucleus

- Centrosomes etc duplicated

- Cell enlarged

Stages of Mitosis

...

Answered by Daisy W. • Biology tutor

4203 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...

Answered by Kinari P. • Biology tutor

9103 Views

I struggle with exam timing and as a result I always run out of time before finishing the paper. How can avoid this in the future?

This is a fairly common problem across many A level subjects but in my experience particularly amongst those taking biology papers. Whilst there are several strategies to counteract this, such as prioriti...

Answered by Rory C. • Biology tutor

2706 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...

Answered by Adrian C. • Biology tutor

16678 Views