Homologous chromosomes carry the same types of genes. Homologous chromosomes are 99% identical. The physical location of a gene on the chromosome is called an allele. Haploid organisms can have homologous chromosomes. Chromosomes that are heterozygous for an allele are not homologous. Homologous chromosomes may contain different alleles of a gene.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.