BIO 340 GENETICS, EVOLUTION AND SOCIETY
LECTURE STUDY QUESTIONS AND ANSWERS A+
GRADED SPRING SERIES.
, Short Answers
1. Twin studies (8 points total)
a. Describe briefly the events and timing during development that leads to the
formation of conjoined twins
i. 1 egg cell is fertilized by one sperm however the inner cell mass begins to
separate after the 12th day of fertilization causing the embryos conjoined.
(74% conjoined by the torso.)
b. Which part of the body are mist conjoined twin most often joined
i. The torso
c. On average, what percentage of genetic makeup is shared by any pair of
non-identical siblings?
i. 50%
d. Is this percentage the same as you would expect for a parent child
relationship? (Yes or no)
i. Yes
2. Heritability studies (4 points total)
a. What value (or parameter) is commonly used as an estimate of heritability
from a regression analysis
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