The blood-brain barrier is made up of

a. ependymal cells and venous blood vessels.
b. astrocyte perivascular feet and capillary endothelial cells.
c. microglial extensions and capillary endothelial cells.
d. astrocyte extensions and dural sinuses.
e. astrocyte perivascular feet and the falx cerebri.

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?

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f

What is responsible for the uneven heating between the poles and the equator on any given day