　　Huntington’sdisease is by far most prevalent in peopleof Western Eur-考呗网

GRE

简答题　　Huntington’sdisease is by far most prevalent in peopleof Western European
descent．Its onset typically presents as lack ofcoordination and a jerky gait．Often， symptoms are nonexistent until the carrier of the mutation is in hisor her late 30s． Line After that，the patient’sdecline may be slow or rapid，eventually resulting in(5)physical and mentaldegeneration．Although everyone carries the gene known as huntingtin，veryfew carry the mutation that results in the disease．Ifone parent carries the mutation，each offspring has a 50．50 chance of inheriting the mutated gene．Genetictesting and counseling are often recommended for family members of Huntington’s patients． (10)The test uses a blood sampleto isolate the huntingtin gene and count the number of CAG repetitions in thatgene．Forty ormore repeats usually means that the person carries the disease．
Consider each of the choicesseparately and select all that apply．根据以上内容，回答题。
If a father of four children carries theHuntington’s mutation，which ofthese is tnle?

Select one answer choice．

参考答案：暂无进入在线模考

A，B，C．
A child of a carrier has a 50．50 chance of inheriting the mutated gene，meaning a 50—50 chance of presenting with the disease．You would expect，hen，in a family of four children，that half would inherit and present (choices A，B)，and half would not(choice C)．

你可能感兴趣的试题

1 Based on information from the passage，which of these people would be
MOST likely to develop Huntington’s disease?

点击查看答案进入在线模考

2 Underline the sentence that shows theunpredictability of Huntington’sdisease．

点击查看答案进入在线模考

3The Medal of Honor，created in 1862，is the highest military decoration availablein the United States．It may be bestowed on members of any of the armed
forces，and it is given to those who distinguish themselves with “gallantry Lineand intrepidity at the risk of[their lives]above and beyond the call of duty，”
(5)especially when engaged in armed conflict with an enemy of the United States．Three designs exist；one is for army members，one for navy members or marines，and one for the air force．Aii three involve a five—pointed star mounted on a blueribbon．Because of its rarity and importance(there have been just over 3，400recipients in l48 years)，the Medal of Honor is always personally awarded by the(10)president of the United States on behalf of tlle Congress．
Select one answer choice．
Based on the information given in the passage，which of these statements about the existing designs of the Medal of Honor is accurate?

点击查看答案进入在线模考