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Describe the difference between centromeres and kinetochores.

A phenotypically normal man with phenotypically normal parents has a sister who has the recessive disease phenylketonuria (PKU). What is the probability that the man is a carrier of the PKU allele?

A “mistake” is happening during meiosis in the following figure. Assume the other part of meiosis is normal. How many chromosomes would be expected in the four cellular products resulting from meiosis?

True-breeding yellow corn is crossed with pure-breeding purple corn.  The F1 from this cross are then crossed with each other, resulting in an F2 of 280 yellow corn and 70 purple corn.  Determine whether this cross follows Mendelian rules of segregation for a monohybrid cross. (1 point each, 7 points total) A. What is your null hypothesis? B. Given your hypothesis, how many dominant offspring do you expect from this cross? C.  Given your hypothesis, how many recessive offspring do you expect from this cross? D.  What is the Chi square value you calculated based upon your expected results in B and C? E.  What is the degree of freedom? F.  What is the p-value (range is fine)? G.  Do you reject the null hypothesis (yes or no)?

Freckles are caused by a dominant allele. A man has freckles, but one of his parents does not have freckles. What is the man’s genotype?

Achondroplasia is a common cause of dwarfism in humans. In a large study of 79 children, who each had two parents with achondroplasia, 28 children were of normal height and 51 children had achondroplasia. Which mode of inheritance could explain this result?

Based upon the pedigree shown here, what is the mode of inheritance of the disease being studied?  

Biodiversity hotspots contain an unusually large number of:

Which of the following sources emits the most greenhouse gases:

Over the next 90 years, climate change is expected to cause Great lakes water levels to ________________________.