Human Populations Are Known to Isolate Themselves from Other Groups

question 63

Essay

Human populations are known to isolate themselves from other groups based on cultural identity,language religion,etc.Some of these communities in North America include the Ashkenazi (descendants of European Jewish communities,Yiddish speakers),the Cajun population of Louisiana,the Arcadian population of Canada,and the Old Order Amish community of Pennsylvania.One in every 27 members of the Ashkenazi community,the Cajun population of Louisiana,the Arcadian population of Canada,and the Old Order Amish community of Pennsylvania carry the recessive Tay Sachs gene (Tay Sachs disease is caused by a recessive mutation on chromosome 15,and children with Tay Sachs rarely live beyond age 5),but this recessive gene is only found in 1 of every 250 people in the general North American population.Explain the high incidence of Tay Sachs among the Ashkenazi,Cajun,Arcadian,and Old Order Amish populations.

---

Definitions:

Active Sites

Regions on enzymes where substrate molecules bind and undergo a chemical reaction.

Cross-Bridges

The connections formed between actin filaments and myosin heads during muscle contraction, enabling force generation.

Actin Myofilaments

Thin filaments primarily composed of the protein actin, playing a crucial role in muscle contraction and cell movement.

Sarcoplasmic Reticulum

A specialized type of smooth endoplasmic reticulum found in muscle cells, responsible for storing and releasing calcium ions, which are crucial for muscle contraction.