A stroke occurs when blood flow to a part of the brain stops. A stroke is sometimes called a brain attack.. If blood flow is cut off for longer than a few seconds, the brain cannot get nutrients and oxygen. Brain cells can die, causing lasting damage.
A cell is said to be homozygous for a particular gene when identical alleles of the gene are present on both homologous chromosomes. The cell or organism in question is called a homozygote. True breeding organisms are always homozygous for the traits that are to be held constant.
I will use H (dominant) and h(recessive) to represent the zygotes. Heterozygous means Hh, and Hh parents. The 4 possibilities are: HH, Hh, hH, and hh. That leaves 2 out of 4 which is 50% For the next question, homozygous dominant would be HH and HHparents.There is 0% of getting a homozygous recessive (hh) offspring.Use punnet squares to figure this out.he 4 possibilities are: HH, Hh, hH, and hh. That leaves 2 out of 4 which is 50% For the next question, homozygous dominant would be HH and HHparents. There is 0% of getting a homozygous recessive (hh) offspring. Use punnet squares to figure this out.