AT&T; LTE 12:16 AM 0 20% blackboard.jhu.edu Path: p QUESTION Twin studies have b

Question

AT&T; LTE 12:16 AM 0 20% blackboard.jhu.edu Path: p QUESTION Twin studies have been used to study the phenotype of "taking up smoking during adolescence". In most studies, MZ concordance is around 90% and DZ concordance is around 70%, and both are much higher than the 20% concordance of unrelated adolescents. Concordance refers to the frequency of the second individual in the comparison to take up smoking given the first individual did so. This means we can use the simple formula discussed in class to estimate genetic contributions or heritability (H) (MZ-DZ) 2. The contribution of shared environment is equal to MZ-H (or DZ-H/2). Using the data described for adolescent smoking, please calculate the contributions of genetics and environments to this behavior QUESTION 7 1 points Save Awe Does it make sense that shared environment would have a larger role in taking up smoking han the role of genes? Explain how the environment might influence this particular trait TTI

Explanation / Answer

Answer 6

genetic contribution is given by H=(MZ-DZ)*2

contribution of shared environment is given by=MZ-H

MZ=90 %=0.9

DZ=70%=0.7

genetic contribution is given by H=(MZ-DZ)*2=(0.9-0.7)*2=0.4 or 40 %

contribution of shared environment is given by=MZ-H=0.9-0.4=0.5 or 50 %

answer 7

Yes ,it make sence that shared environment would have a larger role in taking up smoking than the role of genes.Our  phenotype is influenced during embryonic development and throughout your life by environmental factors. Environmental factors are many and varied and include diet, climate, illness and stress.Since environment affect our trait throughout life .There are more chance that shared environment would have a larger role in taking up smoking than the role of genes.Our genotype or genetic make-up plays a critical role in our development. However, environmental factors influence our phenotypes throughout our lives, and it is this on-going interplay between genetics and environment that makes us all unique.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.