D Question 2 0.2 pts A quantitative trait is frequently influenced by many diffe

Question

D Question 2 0.2 pts A quantitative trait is frequently influenced by many different genes. O True False Question 3 0.2 pts Quantitative traits show simple and predictable patterns of inheritance. O True False D Question 4 0.5 pts Some of the problems with using traits like hitchhikers thumb and earlobe shape to teach human genetics is that... these traits show descrete variation these traits are continuously variable these traits are not likely controlled by a gene at a single locus there is no simple dominance/recessive relationship detected in mating studies these traits are not influenced by genes at all

Explanation / Answer

4) Options2, 3 and 4 are correct.

Most of the visible genetic traits such as hitchhiker's thumb or earlobe shape do NOT have a simple one-locus, two-allele, dominant vs. recessive method of inheritance. While there is a genetic influence on thumb angle, thumbs do not divide into two categories, hitchhiker's and non-hitchhiker's. Instead, the thumb angle varies continuously, with most thumbs having intermediate values. Earlobes do not fall into two categories, "free" and "attached"; there is continuous variation in attachment point, from up near the ear cartilage to well below the ear.

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