Which is defined by the presence of two or more different alleles in a population for a given locus?
a. a gene pool
b. heterozygosity
c. polygenic stasis
d. genetic polymorphism
e. frequency independent selection
d
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Amniocentesis involves sampling ____
a. the embryo at the eight cell stage b. fetal cells in the amniotic fluid c. sperm or egg cells d. fetal skin tissue e. placental cells
Which of the following allows for the earliest analysis of an embryo for a genetic disease?
1.fetoscopy 2.pre-implantation diagnosis 3.chorionic villus sampling 4.amniocentesis
"Nissl stain" visualizes i) _______, and ii) _________ of neuron.
a) (i) nucleus, (ii) rough ER b) (i) nucleus, (ii) smooth ER c) (i) cytoskeleton, (ii) rough ER d) (i) cytoskeleton, (ii) smooth ER
Three weeks after conception, which of the following has happened in an embryo?
A) organ formation B) primitive eye formation C) limb bud formation D) neural tube formation