June 19, 2008 at 1:45 pm #9761someoneParticipant
I am quite weak in this and would be great if i could have the answers for these questions or even notes on evolution
Hardy-Weinberg Law Problems
Screech owls are found in two different colour patterns: red and gray. Scientists have raised and bred
these owls in captivity. The scientists mated red to red, red to gray, and gray to gray. The red to gray
matings usually gave equal numbers of red and gray offspring, but sometimes gave only red offspring.
A population survey done in Pennsylvania showed the population to be composed of 51% red and 49%
gray owls. Use the Hardy-Weinberg equations and Table A below to help you answer the questions
a) Which gene is dominant and which gene is recessive? How can you determine this?
b) Calculate each allele frequency.
c) Suppose the frequency for red feathers is 0.42 ten years later in the same population. What could
have caused the change in the gene frequency?
d) What is the percentage of heterozygous owls?
The ability to taste a chemical substance called PTC is the result of inheriting a dominant gene (P).
Humans that are hybrid (Pp) for the gene are also tasters. Humans that are pure recessive cannot taste
PTC. A population sample was taken in a small town and of 1092 people tested 64% were found to be
a) How many people in the sample can taste PTC?
b) What is the frequency of each allele?
c) What percent of the population are heterozygous? How many people are heterozygous?
d) What percent of the population are homozygous dominant? How many people are homozygous?
e) A sample was taken in the same town 15 years later and the allele frequencies were found to be
the same as in the earlier sample. How can you account for this result?
One in 1700 US Caucasian newborns have cystic fibrous. C for normal is dominant over c for cystic
fibrous. What percent of the population is homozygous dominant, and thus not carrier of the disease?
4. If 9% of an African population is born with a severe form of sickle-cell anemia (ss), what percentage of the
population will be more resistant to malaria because they are heterozygous(Ss) for the sickle-cell gene?
June 19, 2008 at 2:40 pm #84645mithParticipant
wish I paid attention in class
June 20, 2008 at 12:47 pm #84673February BeetleParticipant
I’m sure this person wishes they did, too.
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