What do the stars in the circled regions “A”, “B”, and “C” all have in common?

Give two features of the luminosity of Type Ia supernovae that makes them useful for determining the distance to distant galaxies. Clearly explain why these features are useful.

In a population of 5000 which has been under Hardy-Weinberg conditions for a number of generations and is known to contain a total of 450 individuals that are homozygous dominant (TT) at a particular locus. What are the gene frequencies?

All of the following are true concerning mating systems except 

If a recessive allele is lethal, and the homozygous recessive individuals die at birth, over time the frequency of the homozygous dominant will

P + H + Q = 1 p + q = 1 P = p2 H =  2pq Q = q2

In a population of 5000 which has been under Hardy-Weinberg conditions for a number of generations and is known to contain a total of 450 individuals that are homozygous dominant (TT) at a particular locus. What is the frequency of Q?

Simply-inherited traits are affected highly by environment.

If a recessive allele is lethal, and the homozygous recessive individuals die at birth, over time the frequency of the heterozygote will

Rank the following in terms of when they would have first formed after the Big Bang.