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.
Answer by Lkstorer. Confidence votes 209. I would think the opposite of homozygous dominant is homozygous recessive. A genotype that is homozygous dominant contains two dominant alleles (forms of the gene), and one that is homozygous recessive contains two recessive alleles. Heterozygous would be in between the other two, with one dominant and one recessive allele.