Dictionary > Incomplete dominance

Incomplete dominance

Incomplete dominance, a phenomenon that is responsible for variations in different life forms leading to enhanced and better reforms through the genetics used by humans.

Quiz

Choose the best answer.

1. Which of the following correctly depicts incomplete dominance?

The dominant allele masks the effect of the recessive allele

Both alleles are expressed

The expression of the alleles results in an intermediate phenotype

2. Which of the following implies heterozygous alleles?

3. The genotypic ratio when two heterozygotes (pink) are crossed

1:1:1:1

1:2:1

4:0

4. In a test cross between two pink-flower bearing plants, how many offspring will be homozygous recessive?

One

Two

Four

5. What is the difference between incomplete dominance and codominance?

The offspring shows both parental phenotypes in incomplete dominance whereas in codominance the offspring does not show the parental phenotype

In incomplete dominance, the phenotype of the offspring will express the traits of the parents as uniformly conspicuous whereas in codominance the opposite occurs

In incomplete dominance, the phenotype of the offspring is different from those of the parents whereas in codominance, the offspring has both traits of the parents

6. Which of these best describes incomplete dominance?

Both phenotypes are exhibited

Only one phenotype is fully expressed

A phenotype that is blended or intermediate

7. Which is an example of incomplete dominance?

Hybrid rose with streaks of red on white petals

A dog with full black coat

A child with a blend of straight and curly hair

8. How is incomplete dominance expressed in a phenotype?

Phenotype is neither dominant nor receissive

Phenotype is either dominant or receissive

Phenotype is both dominant and receissive

9. Why is incomplete dominance considered an exception to Mendel’s principles of inheritance?

It doesn't conform to Mendel’s principles of inheritance

There is no inheritance of trait

Mendel’s principles of inheritance is no longer relevant to this day

10. Which is true of both incomplete and co-dominance?

Neither allele is completely dominant over the other

Neither allele is incompletely dominant over the other

Both alleles are completely dominant

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