Which of the following facts about genes is incorrect? A. A gene can code for a specific protein
B. A gene can exist in alternate forms called alleles
C. A gene undergoes crossing over during meiosis and can switch chromsomes
D. A gene that is very similar in sequence in a human and in a bacterium is probably a recent mutation.
E. If parents do not express a gene but their child does, that gene is probably recessive.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

b. read the phase at the intersection of any given temperature and pressure.