Overview of interacting Genes Practice Problems

The plateau phenomenon in selective breeding can occur because of which of the following reasons:

The ear length of corn is controlled by 2 pairs of dominant polygenes in an additive way. If the longest one is 10 cm in length and the shortest one is 2 cm in length how much length is contributed by each dominant allele.

The size of the seeds of the sativum plant is controlled by one gene having four alleles what are the number of possible genotypes for this plant?

When the number of _________ increases the number of phenotypic categories also increases.

X and Y are two genes which control the length of a leaf and have a cumulative relationship. These genes have two alleles X₁ and Y₁ each contributing 3 cm to the length of the leaf and X₂ and Y₂ each contributing 2 cm to the length of the leaf.
What will be the leaf length having genotype X₂X₂Y₁Y₂.?

When many pairs of genes control a single trait of a plant and show additive relationship, where each allele contributes quantitatively to the trait is referred to as ________.

Suppose the giraffe's neck is controlled by three genes namely CD and E. If C, D, and E alleles can give a neck length of 12.5 cm and c, d, and e alleles can give a neck length of 9.5 cm, which of the following genotypes will you expect to give the highest neck length?

In statistical analysis of phenotypes, what does variance determine?

Why is human height classified as a polygenic inheritance?

What does a heritability of 0.60 imply?

Heritability can be defined as the amount of phenotypic variation in a specific population that is caused by:

Which of the following describes a simple random sampling?

Which of the following is an example of a threshold trait?

The quantitative trait locus is the specific region of the DNA that is associated with a specific trait such as the:

Which of the following statements about polygenic inheritance is correct?

Which of the following statements about multifactorial inheritance is true?

Concordance refers to the probability of two individuals obtaining a certain trait considering that one of them has that trait. Which of the following is therefore true if we apply it to dizygotic twins?

Which of the following describes additive genes?

Which of the following statements about broad-sense heritability is true?

Which of the following is an example of phenotypes that are considered multifactorial traits?

The following are examples of quantitative traits except:

In a case where a wild-type allele produces an enzyme with full activity and a mutant allele produces very little enzyme activity, the mutant allele is:

In a case where a wild-type allele produces an enzyme with full activity and a mutant allele produces none at all, the mutant allele is:

Which of the following is an example of multiple allele phenotypes?