A healthy couple with a history of three previous spontaneous abortions has just had a child with cri-du-chat syndrome, a disorder caused by a terminal deletion of chromosome 5. Their physician orders karyotype analysis of both parents and of the child. The karyotype results for chromosomes 5 and 12 are shown here.Are the chromosomes in the child consistent with those expected in a case of cri-du-chat syndrome? Explain your reasoning.

An intragenic deletion is a deletion found where?

Deletions can cause what type of phenotype?

Which of the following genetic diseases is an example of a chromosomal deletion?

Human late prophase karyotypes have about 2000 visible G bands. The human genome contains approximately 22,000 genes. Consider the region 5p1.5 through the end of the short arm of chromosome 5, which is identified on the late prophase chromosome in Figure 10.5, and assume the entire region is deleted. Approximately how many genes will be lost as a result of the deletion?