Trisomy 21,or Down Syndrome,occurs When There Is a Normal Diploid

question 37

Multiple Choice

Trisomy 21,or Down syndrome,occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21.Although fertility is reduced in both sexes,females have higher fertility rates than males.Van Dyke et al.(1995; Down Syndrome Research and Practice 3(2) : 65-69) summarize data involving children born of Down syndrome individuals.Assume that children are born to a female with Down syndrome and a normal 46-chromosome male.What proportion of the offspring would be expected to have Down syndrome?

• A) One-third of the offspring would be expected to have Down syndrome.
• B) Two-thirds of the offspring would be expected to have Down syndrome.
• C) All the children would be expected to have Down syndrome.
• D) None of the offspring would be expected to have Down syndrome.
• E) One-half of the offspring would be expected to have Down syndrome.

Explain the stages and significance of spermatogenesis.

Describe the role and mechanisms of testosterone in male reproductive health.

Outline the structure and function of female reproductive organs.

Recognize the hormones involved in female reproductive processes and their effects.

---

Definitions:

Exposures

Contact with potentially harmful physical, chemical, or biological agents, either inadvertently or in a controlled manner for scientific study.

Malpractice

A failure by a professional to provide services with the competently expected level of skill or care, resulting in harm or injury to a person.

Bad Practice

Actions or behaviors, especially in professional settings, that are considered incorrect, unethical, or detrimental to clients or the profession itself.

Medical Treatment

The management and care of a patient to combat disease or disorder, including the administration of medication, surgery, therapy, or other corrective measures.