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samsecondex - NAME ANS 3384 EXAM 2(3 pts 1 What type of...

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NAME ______________ ANS 3384 EXAM 2 MARCH 23, 2009 (3 pts) 1. What type of gene action ( dominance // additive ) is associated with heritability and is important to the amount of selection response to be expected in purebred populations? (4 pts) 2a. Give examples of one trait that is lowly heritable and one that is highly heritable. Lowly heritable Highly heritable (4 pts) 2b. How does an increase in V E affect the heritability of a trait? (4 pts) 3. What does the repeatability of a trait measure? Circle THE correct answer. a. the amount of selection progress possible. b. the correlation between repeated records on groups of individual animals c. the amount of superiority passed on to the progeny d. the selection differential (4 pts) 4. If the repeatability of trait is high, say .90, what should you do with an animal after it performs badly for that trait for the first time? Why? (4 pts) 5. Why is the intensity of selection almost always much higher in males than in females?
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(4 pts) 6. How can the use of superovulation of cows and subsequent transfer of their embryos to recipients result in a higher intensity of selection?
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