Top answers

Biology
A Level

Tom is an expactant father who is worried that he will pass on his Haemophilia A, an X linked recessive disease, to his offspring. The mother is homozygous dominant. Explain why his 1st generation offspring will not be affected by the condition.

A recessive inheritance pattern means that 2 copies of the mutant allele need to be inherited for the individual to be affected. The disease is X linked, meaning the allele is only found on the X chromoso...

Answered by Eilidh W. Biology tutor
1571 Views

What is the difference between a haploid and diploid cell

A haploid cell contains half the number of chromosome, for example a haploid human cell would have 23 chromosomes as opposed to 46. These haploid cells will be the sperm or egg cell (the gametes) A diploi...

Answered by Katie P. Biology tutor
3158 Views

How does anti-diuretic hormone work to control water loss?

What is it?Anti-diuretic hormone (ADH) is a hormone produced by the hypothalamus and released by the posterior pituitary gland (in the brain), that acts on the nephron in the kidney, specifically the dist...

Answered by Ellie T. Biology tutor
1641 Views

Describe the role of a ribosome in the production of a polypeptide.

The ribosome acts as a translator, by binding to an mRNA and 'reading' the codon codeA codon is 3 bases on an mRNA, and each codon encodes an amino acidThe ribosome brings the tRNAs with the correct antic...

Answered by Elizabeth H. Biology tutor
2244 Views

How is an action potential generated?

An action potential is the propagation of the reversal of charge across a membrane voltage gated Na+ ion channels sense a change in membrane potential causing them to open Na+ moves down its concentration...

Answered by Emma H. Biology tutor
1882 Views

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