Author Question: Which is a birth defect or disorder that occurs as a new case in a family and is not inherited? ... (Read 81 times)

asmith134

  • Hero Member
  • *****
  • Posts: 576
Which is a birth defect or disorder that occurs as a new case in a family and is not inherited?
 
  a. Sporadic
  b. Polygenic
  c. Monosomy
  d. Association

Question 2

Which genetic term refers to the transfer of all or part of a chromosome to a different chromosome after chromosome breakage?
 
  a. Trisomy
  b. Monosomy
  c. Translocation
  d. Nondisjunction



wshriver

  • Sr. Member
  • ****
  • Posts: 318
Answer to Question 1

ANS: A
Sporadic describes a birth defect previously unidentified in a family. It is not inherited. Polygenic inheritance involves the inheritance of many genes at separate loci whose combined effects produce a given phenotype. Monosomy is an abnormal number of chromosomes whereby the chromosome is represented by a single copy in a somatic cell. A nonrandom cluster of malformations without a specific cause is an association.

Answer to Question 2

ANS: C
Translocation is the transfer of all or part of a chromosome to a different chromosome after chromosome breakage. It can be balanced, producing no phenotypic effects, or unbalanced, producing severe or lethal effects. Trisomy is an abnormal number of chromosomes caused by the presence of an extra chromosome, which is added to a given chromosome pair and results in a total of 47 chromosomes per cell. Monosomy is an abnormal number of chromosomes whereby the chromosome is represented by a single copy in a somatic cell. Nondisjunction is the failure of homologous chromosomes or chromatids to separate during mitosis or meiosis.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

For a complete list of videos, visit our video library