Identify the pattern of Mendelian inheritance represented in the pedigree above and explain how you made this determination. What will be an ideal response?
ANSWER: This pedigree represents a pattern of Y-linked inheritance. Only males have Y chromosomes,
so traits encoded by genes on the Y are passed directly from father to son. All Y-linked traits
are expressed in males because males are hemizygous for all genes on the Y chromosome.
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Explain negative feedback control using thyroid hormones as an example
What will be an ideal response?
There is a controversy over pre-teen girls receiving the HPV vaccine. Many parents think that giving this vaccine condones sexual activity at a young age. On the other hand, there are parents who do not want their kids to pick up STIs. Why is the vaccine recommended for 11-12 year old girls? Why not give the vaccine to young adult women who are just becoming sexually active?
A. Very young women tend to get cancer from HPV, whereas women who are older get warts from HPV. B. The immune system is strongest in pre-teen girls, so it is best to give the vaccine very early in life. C. Once the young woman becomes infected with HPV, the virus gets into cells. It is then too late to vaccinate. D. The vaccine is cheaper for young girls since the dosage of virus in the vaccine is far less than that given for older women.
. Which of the following are characterized by
radially symmetrical members?
a. annelids b. arthropods c. cnidarians d. roundworms e. flatworms
Which substance might induce seeds treated with it to break dormancy?
A) an auxin B) a cytokinin C) a gibberellin D) ethylene