Which of the following is true when analyzing a pedigree?
a. If a disorder is caused by a sex-linked trait, only male offspring will have the disorder.
b. If a disorder is caused by a dominant trait, two normal parents can produce an offspring with the disorder.
c. If a disorder is caused by a recessive trait, every offspring afflicted with the disorder will have a parent with the disorder.
d. If a disorder is caused by a recessive trait, the normal parents of every offspring with the disorder are carriers
Ans: d. If a disorder is caused by a recessive trait, the normal parents of every offspring with the disorder are carriers
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A large percentage of energy passes on from one trophic level to the next
Indicate whether the statement is true or false.
In what way do steroid hormones differ from
hormones derived from amino acids?
a. steroid hormones are not derived from organic molecules b. steroid hormones do not need a plasma membrane receptor c. steroid hormones use a second messenger system d. steroid hormones do not travel in the blood e. more than one of these is a way in which steroid hormones differ from amino acidderived hormone
The history of life on earth spans nearly
a. 100,000 years. b. 500,000 years. c. 100 million years d. 1 billion years. e. 4 billion years.
______________ twins result from a single fertilization event. Fill in the blank(s) with the appropriate word(s). Fill in the blank(s) with the appropriate word(s)