A rancher had 500 cows and took one shot that got them all. How did he do it?

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

Can a trait be both polygenic and have multiple alleles? explain why or why not.