Top answers

Why is genetic diversity important within a population?

Genetic diversity within a population is the variety of different alleles (versions) of genes present, which lead to a variety of phenotypes. It is important for a number of reasons, such preventing inbreedi...
RS
Answered by Rosie S. • Biology tutor
10780 Views

Why does nuclear radius decrease and first ionisation energy increase across the period?

As we move across the period electrons occupy the same outer electron shell, having roughly the same distance to the nucleus. Moving across the period nuclear charge increases as the number of protons in the...
JM
Answered by James M. • Chemistry tutor
4315 Views

A circle C with centre at the point (2, –1) passes through the point A at (4, –5). Find an equation for the circle C.

You would start with this equation (x – a) 2 + (y – b) 2 = r 2 , with the center being at the point (a, b) and the radius being "r". Therefore you would have (x-2) 2 +(y+1) 2 =r 2 , in order to det...
IN
Answered by Ishan N. • Maths tutor
6014 Views

How did Meselson and Stahl provide evidence for semi-conservative replication?

One sample of bacteria was grown in a nutrient broth containing light nitrogen (N 14 ) and one was grown in a broth with heavy nitrogen (N 15 ). The bacteria took up the nitrogen to make new nucleotides so i...
CS
Answered by Chloe S. • Biology tutor
22933 Views

What is the role of tumour suppressor genes and oncogenes in the development of tumours?

Think of tumour suppressor genes and oncogenes like the pedals used to operate a car. Oncogenes are mutated forms of proto-oncogenes. Normally, these proto-oncogenes act like the gas pedal, and allow the cel...
TD
4163 Views