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What changes occur in the body when you are too hot? (5 marks)

1. Hypothalamus is thermoregulatory centre in brain. This detects increase in temperature (above 37 degrees Celsius) and is activated.2. Hypothalamus causes vasodilation of skin capillaries, which causes hea...
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Describe the meaning of the terms: gene, genetic locus, alleles, phenotype and genotype

A gene is a length of DNA that codes for a particular trait. ( Think of- jeans - they are long items (length) of clothing, what they're made out of determines what they are. This is a key concept of genetics...
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Answered by Eoin M. • Biology tutor
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What are dominant and recessive alleles?

Alleles are different versions of the same gene, which give different characteristics (or phenotypes ) when expressed. Each gene has a pair of two alleles, and these pairs can be homozygous , meaning both al...
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Answered by Chloe B. • Biology tutor
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Compare the issues involved in the use of embryo screening for cystic fibrosis and for polydactyly.

Screening embryos for conditions carries the risks of possible harm to the mother and harm to the embryo, including possible loss of the embryo. The result of the screening could also carry ethical implicati...
Answered by • Biology tutor
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What are the different parts of the heart?

The heart is made up of four chambers. The ones at the bottom are called right and left ventricles and those at the top are the left and right atria. The left and right sides are divided by the septum, a thi...
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Answered by Lucía T. • Biology tutor
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