1. In early cell cycles there are only two phases (M and S). Name the protein complex used for cell
cycle phase progression. When is it inactive and active? How is it regulated? 2. How does the
amount and distribution of yolk influence embryonic cleavage patterns? 3. How is the direction of
shell coiling determined? What experiments demonstrate the cellular and molecular bases of this
phenotype? 4. In snails, a left coiling shell phenotype is recessive and right coiling is dominant.
Explain how it is possible for a cross between a left coiling snail and a right coiling snail to yield
100% left coiling progeny. In this scenario, which parent (mom or dad) must be left coiling and
which must be right coiling. 5. What is the polar lobe? What is it importance to snail development?
Design an experiment to identify the cytoplasmic determinants located in the polar lobe..
1 In early cell cycles there are only two phases M and S.pdf
1. 1. In early cell cycles there are only two phases (M and S). Name the protein complex used for cell
cycle phase progression. When is it inactive and active? How is it regulated? 2. How does the
amount and distribution of yolk influence embryonic cleavage patterns? 3. How is the direction of
shell coiling determined? What experiments demonstrate the cellular and molecular bases of this
phenotype? 4. In snails, a left coiling shell phenotype is recessive and right coiling is dominant.
Explain how it is possible for a cross between a left coiling snail and a right coiling snail to yield
100% left coiling progeny. In this scenario, which parent (mom or dad) must be left coiling and
which must be right coiling. 5. What is the polar lobe? What is it importance to snail development?
Design an experiment to identify the cytoplasmic determinants located in the polar lobe.
