In the sentence Chromosomes _____, the choices that correctly completes the sentence are: are tight coils of DNA; can be analyzed in a karyotype; carry thousands of genes. Chromosomes are tight coils of DNA. It is a thread-lice structure into which DNA molecule is tightly packed around proteins. A section of a chromosome that typically contains the code for a particular protein is called a gene. Chromosomes carry thousands of genes. A test used to identify an organism's chromosomal makeup and to detect genetic defects is called karyotype.
