Biology 12 Chapter 21 Development and Aging - 8

Biology 12 Chapter 21
Development and Aging - 8

1. Hypothesis related to control of development is………….?

a) Lamarckism
b) Hardy-Weinberg
c) Roux-Weismann
d) Roux-Wallace

2. Who concluded that both half embryos contained all the genetic information of the original zygote?

a) Hans Spemanns
b) Hans Drieschs
c) Weismann
d) Roux

3. At which stage one nucleated cell enter into anucleate side?

a) 2 cells stage
b) 4 cells stage
c) 16 cells stage
d) 15 cells stage

4. The pigment free area in the egg is called……………?

a) Blastocoel
b) Animal pole
c) Vegetal pole
d) Grey crescent

5. Grey crescent appears at the moment of…………….?

a) Gastrulation
b) Embryo development
c) Fertilization
d) Neurulation

6. If grey crescent is NOT present the cells are…………….?

a) Differentiated embryo
b) Undifferentiated mass of cells
c) Undifferentiated embryo
d) Differentiated mass of cells

7. The side lacking grey crescent results in……………..?

a) Organized piece of brain tissue
b) Organized piece of belly tissue
c) Unorganized piece of belly tissue
d) Unorganized piece of brain tissue

8. Which animal has NOT the developmental fates due to cytoplasmic segregation and inductive interactions?

a) Insect
b) Reptiles
c) Birds
d) Amphibians

9. Who did disapprove the Roux-Weismann hypothesis?

a) Hans Spemanns
b) Hilde Mangold
c) Hans Drieschs
d) Weinberg

10. Which is NOT the way to commit cells to developmental fates?a) All of them
b) Inductive interactions
c) Cytoplasmic segregation
d) Cleavage due to grey crescent

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