What causes the aortic semilunar valve to close?

Complete the possible outcomes for each generation in the pedigree chartaa aa aa

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a