Answer/Explanation:
Red/green colorblindness is a recessive, X-linked condition. That means that the affected gene is on the X chromosome, and that the phenotype will only be present if there is no "healthy" gene, which is dominant to the mutated gene.
For two unaffected people to have an affected son, the mother must be a carrier. Remember, females have two X chromosomes and males have one. So if a female is a carrier of the colorblindness mutation, she will have one copy of the mutation and one normal copy of the gene, and will therefore be unaffected.
The punnet square (attached) shows that all their female children would be unaffected (have the B gene), but 1:2 male children would be colorblind, as their only copy of the gene is mutated (b).
Karyotype is written in the form: No. of chromosomes, sex chromosomes
As, we know there are 46 chromosomes in humans & sex chromosomes may be XX for females & 'XY' for males so, we can write it as:
(46, XX) or (46, XY)
There could be some anomalies though. So, for more appropriate answer, you should put your options!
Hope this helps! Pm me in case of doubt! Happy Studying :)
Synapse
A synapse is a junction where there is a small gap between the neurons.The synapse permits the flow of electrical or chemical signals from neuron to neuron, allowing these neurons to communicate and pass information among themselves.
The chemical synapse converts the electrical signal to a chemical response by releasing chemicals called neurotransmitters, which are received by receptor sites in the other neurons. The electrical synapse allows the flow of ions from one neuron to another to pass the electric current or signal.
The branch of chemistry that involves the study of substances and processes occurring in living things is:
Biochemistry<span />