Related Questions

Correct Answer is A

Explanation

Choice A Reason: Trisomy numeric abnormality. Down syndrome is a genetic disorder that occurs when a person has three copies of chromosome 21 instead of two. This extra chromosome causes various physical and mental features that vary from person to person. Down syndrome is also called trisomy 21 because it involves three copies of chromosome 21.

Choice B Reason: Multifactorial inheritance is incorrect because it refers to a type of genetic disorder that results from the interaction of multiple genes and environmental factors. Examples of multifactorial disorders include cleft lip or palate, neural tube defects, diabetes, hypertension, and some types of cancer.

Choice C Reason: X-linked recessive inheritance is incorrect because it refers to a type of genetic disorder that affects males more than females because it is caused by a mutation on the X chromosome. Females have two X chromosomes, so they can be carriers or affected depending on whether they inherit one or two copies of the mutated gene. Males have one X chromosome and one Y chromosome, so they are always affected if they inherit the mutated gene from their mother. Examples of X-linked recessive disorders include hemophilia, color blindness, and Duchenne muscular dystrophy.

Choice D Reason: Chromosomal deletion is incorrect because it refers to a type of genetic disorder that occurs when a part of a chromosome is missing or deleted. This can cause various physical and mental problems depending on the size and location of the deletion. Examples of chromosomal deletion

Correct Answer is D

Explanation

Choice A Reason: This is incorrect because Ortolani's sign is a test for hip dysplasia in infants, not a sign of pregnancy. It involves moving the infant's legs to check for a clicking sound in the hip joint.

Choice B Reason: This is incorrect because Chadwick's sign is a bluish or purplish discoloration of the cervix, vagina, and vulva during pregnancy, not a softening of the lower uterine segment. It is caused by increased blood flow to the pelvic area.

Choice C Reason: This is incorrect because Goodell's sign is a softening of the cervix during pregnancy, not a softening of the lower uterine segment. It is caused by increased vascularity and edema of the cervical tissue.

Choice D Reason: This is correct because Hegar's sign is a softening of the lower uterine segment or isthmus during pregnancy. It can be felt by bimanual examination around six to twelve weeks of gestation.

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