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TLS Online TPP Program

#Question id: 5656

What is the cortical reaction, and why is it important?

#Unit 5. Developmental Biology

  1. The cortical reaction is the entry of Ca2+ ions into the egg, which initiates development.

  2. The cortical reaction is the exocytosis of the cortical granules during egg maturation, which contain the components of the zona pellucida.

  3. The cortical reaction is the depolarization of the plasma membrane after sperm entry, which helps to block polyspermy.

  4. The cortical reaction is the release of the cortical granules after sperm entry, which converts the vitelline membrane into the fertilization membrane which blocks polyspermy.

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TLS Online TPP Program

#Question id: 14998

#Unit 8. Inheritance Biology

You set up a monohybrid cross between true breeding round winged and true breeding oval winged insects. Your F1 offspring have round wings, and you collect the following numbers of F2: Round wings: 302; Oval wings: 86. Which of the following statements is NOT correct?
TLS Online TPP Program

#Question id: 14997

#Unit 8. Inheritance Biology

You capture several interesting insects from a population in your yard. By inbreeding, you develop true breeding strains that differ only in the shape of their wings - one strain has round wings while the other strain has oval wings. How might you demonstrate that Mendel's principles apply to your insects?
TLS Online TPP Program

#Question id: 14996

#Unit 8. Inheritance Biology

Which of the following most accurately restates Mendel's law of segregation?
TLS Online TPP Program

#Question id: 14962

#Unit 8. Inheritance Biology

In single factor crosses between two true breeding strains of tree frog, a scientist discovers that plain green tree frogs and tree frogs with a red 'racing stripe' always produce offspring that have red racing stripes. Why?
TLS Online TPP Program

#Question id: 14961

#Unit 8. Inheritance Biology

Drosophila females are capable of storing sperm and using it to fertilize eggs long after mating. How might this present a problem for a geneticist?
TLS Online TPP Program

#Question id: 14960

#Unit 8. Inheritance Biology

How might the ability of pea plants to self fertilize be a problem for genetic experiments?