BIOL 108 WORKSHEET 6
1. During what stages of mitosis would one expect to find that each chromosome is
composed of sister chromatids?
2. How many chromosomes are found in a homologous pair?
3. How many chromatids are found in a homologous pair?
4. During what part of the cell cycle are G1 and G2 found?
5. How many chromosomes are found in a human body cell?
6. Do all organisms have the same number of chromosomes?
7. If a cell has 16 pairs of chromosomes, how many chromosomes total (Hint: not pairs) does it have?
8. Which produces polar bodies, oogenesis or spermatogenesis?
9. What are the two stages of the cell division part of the cell cycle?
10. What will happen if cell cycle control mechanisms, such as checkpoints, fail?
11. What gene is thought to be responsible for the intellectual disabilities caused by Down
syndrome? What, specifically, does this gene increase?
12. Give an example of a deletion syndrome. (Must be one listed in the text.)
13. Where would you find a centrosome during metaphase of mitosis?
14. Would a person with a genotype of Aa be homozygous dominant, heterozygous or homozygous recessive?
15. Would an individual with the genotype Aa have a dominant or recessive phenotype?
16. What is the problem with assigning an individual a genotype of Ad for a given trait?
17. What organ is affected by the build up of fatty acid proteins in individuals with TaySachs disease?
18. In a cross of Aa x Aa, what is the probability of having a heterozygous genotype? 19. Clasp your hands together (without thinking about it). The dominant phenotype is left
thumb on top. If your right thumb is on top, what is your genotype: TT, Tt or tt? Explain your answer:
20. Regarding the laws of probability: which rule is often applied to cases in which the word
“and” is used?
21. If two heterozygous individuals have children, what is the probability that their children
will have the recessive phenotype for that trait? (Use a percentage or a ratio for your
answer.)
22. If two heterozygous individuals have children, what is the probability that their children
will have the homozygous dominant genotype for that trait? (Use a percentage or a ratio
for your answer.)
23. What is the genotype of a carrier: homozygous dominant, heterozygous or homozygous
recessive?
24. John has sickle cell disease. Ann is normal and is not a carrier. Can their children have
sickle cell disease (not sickle cell trait)? Explain your answer.
25. Give an example of a polygenic trait listed in the text.
26. If one parent is type AB blood type and the other parent is also type AB blood type, could
they have a child that is O blood type? Explain.
27. If one parent is type B blood type and the other parent is type A blood type, could they
have a child that is O blood type? Explain.
28. Give an example of a trinucleotide repeat disorder listed in the text.
29. For the next questions fill in the Punnett square for the following simple monohybrid
cross. (If you don't understand how to fill in a Punnett square, you can use google for
help.) The alleles for the parents are already entered for you.
A man who is homozygous dominant for unattached earlobes (EE) has children with a
woman who is heterozygous for attached/unattached earlobes (Ee). Use E for unattached
lobes and e for attached lobes.
E
E E e

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