Biology ! ( 40 pts ) and you!

which of the following elements would be the most reactive?

strontium
nitrogen
chlorine
radon

name an element which will chemically behave like xenon.

iodine
carbon
neon
plutonium

how many electrons does a neutral atom of calcium (ca) possess?

none
five
twenty
fourty

what are the starting chemicals in a reaction called?

the products
the reactants
the equilibrium
the yield

what would be a representation of a single-replacement reaction?

a + b --> ab
ab --> a + b
ab + c --> ac + b
ab + cd --> ad + cb

Approximately 90% of all cases of polycystic kidney disease are inherited in an autosomal dominant fashion. the disease is typically related to mutations to genes (pkd1 and pkd2). pkd genes can be found on chromosome 16. the disease occurs in approximately 1: 800 to 1: 1000 people. here is a hypothetical example. the dominant allele d will cause the development of pkd. the recessive allele is known as d. what genotypes would correspond to suffering from pkd? dd, dd what genotypes would correspond to being normal (not suffering from pkd)? dd consider that 1: 1,000 people have pkd in your population of 325million. consider that pkd is inherited in an autosomal dominant fashion. show you math for all of the following questions: what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is p? what is q? how many people in your population would have pkd?

How does natural selection change thephenotypes within a population over time?

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?