Gene Segregation 15 



2.3. Does a parent lose its genetic material when it is transmitted to progeny? Defend 

 your answer. 



2.4. Is it necessary to assume that genes are able to reproduce themselves? Explain. 



2.5. List all the assumptions required to explain a 3 : 1 ratio in Fo on a genetic basis. 



2.6. A black and a white guinea pig are mated and produce all black offspring. Two such 

 offspring when mated produce mostly black but some white progeny. Explain these 

 results genetically. 



2.7. A cross of two pink flowered plants produces offspring whose flowers are either red, 

 pink, or white. Defining your genetic symbols, give all the different kinds of genotypes 

 involved and the phenotypes they represent. 



2.8. What operation was employed in studying the gene in the present Chapter? Define 

 a gene in terms of size. 



2.9. Discuss the role of dominance in the study of genes. 



2.10. Do organisms that reproduce asexually have genes? 



2.11. What relation has a gene to the phenotypic effect with which it is associated? 



2.12. Do you agree with the statement on p. 10 that a cross between two colorless pea plants 

 results in "all colorless progeny"? Why? 



2.13. Throughout this book the use of the word "heredity" and its derivatives has been 

 avoided. Why do you think this is, or is not, justified? 



