Top answers

Bob and Brenda are both heterozygous for a genetically inherited recessive trait. (a) Calculate the probability that they would have a healthy child. Use a genetic diagram to help. (b) Suggest an example of a recessive inherited disorder

Heterozygous means that the parents both carry a dominant allele (A) and a recessive allele (a). Dominant alleles are always expressed in the phenotype. Recessive alleles are expressed in the phenotype only ...
CM
Answered by Charlotte M. • Biology tutor
3386 Views

Neurons do not make direct contact but are separated by synapses. Impulses cross a synapse by means of a neurotransmitter. Describe the process of neurotransmitter release at a synapse. You may use a labelled diagram.

Action potential arrives at axon terminal of presynaptic neuron Voltage-gated Ca2+ channel opens Ca2+ enters the cell Ca2+ signals to vesicles Vesicles move to the membrane Neurotransmitters are released by ...
CM
Answered by Charlotte M. • Biology tutor
3228 Views

How does the circulatory system work?

This system is made up of two main components: the heart and the vasculature. The heart is an organ with two sides, each of which is dedicated to carry out a different job. The right side receives deoxygenat...
NW
Answered by Nicholas W. • Biology tutor
4530 Views

explain diffusion and give an example

diffusion is the movement of particles from a high concentration to a low concentration through a semi permeable membrane. an example would be the movement of food molecules through the gut wall as they pass...
CH
Answered by Charlie H. • Biology tutor
2883 Views

What are the four chambers of the heart and which side receives/delivers oxygenated or deoxygenated blood?

The four chambers of the heart are the upper two atria (atrium for singular) and the lower two ventricles. The atria first receive the blood, which is then pumped to its destination via the ventricles. They ...
JB
Answered by James B. • Biology tutor
3809 Views