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Principles of Inheritance and Variation

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Questions and Answers

What is the reason for the altered phenotype ratios in the Snapdragon monohybrid cross?

Incomplete dominance of R over r (correct)

Lethal alleles

Co-dominance of R and r

Complete dominance of R over r

What is the function of a gene in a diploid organism?

To synthesize proteins

To replicate DNA

To metabolize glucose

To contain information for expressing a particular trait (correct)

What is the difference between the two alleles in a heterozygote?

One is dominant and the other is recessive

One is active and the other is inactive

One is mutated and the other is normal (correct)

One is inherited from the mother and the other from the father

Why are there two copies of each gene in a diploid organism?

Because it is a pair of alleles Signup and view all the answers

What is the result of incomplete dominance in the Snapdragon cross?

A 1:1:1:1 phenotype ratio Signup and view all the answers

What is the role of the normal allele in the enzyme production example?

It produces a normal enzyme Signup and view all the answers

Why can Rr be distinguished from RR and rr in the Snapdragon cross?

Because R is incompletely dominant Signup and view all the answers

What is the term for the phenomenon where one allele is not completely dominant over the other?

Incomplete dominance Signup and view all the answers

What is the significance of the two allelic forms in the enzyme production example?

One is normal and the other is modified Signup and view all the answers

Why does the Snapdragon cross not follow the expected 3:1 dominant : recessive phenotype ratio?

Because R is not completely dominant over r Signup and view all the answers