A manual contains instructions for how to build a variety of structures using a set of interlocking bricks. If this scenario is used as a model for genetic information, which statement is correct?
A. Each structure is a gene.
B. The manual is a chromosome.
C. Each set of instructions is a protein.
D. The interlocking bricks are the chromosomes.
B. The manual is a chromosome.
How are chromosomes and genes alike?
A. They both encode a single protein.
B. They are both part of DNA.
C. They are both found on chromatids.
D. They both contain genetic material.
D. They both contain genetic material.
In pea plants, the allele for round peas, R, is dominant over the allele for wrinkled peas, r. What is the phenotype of a pea plant with genotype Rr?
A. wrinkled
B. round
C. slightly wrinkled
D. some round and some wrinkled
B. round
What determines a trait of an organism?
A. the number of dominant alleles
B. its phenotype
C. the combination of its alleles
D the number of copies of the gene
C. the combination of its alleles
Which statement is accurate about dominant alleles?
A. They are expressed only when a recessive allele is not present.
B. They are expressed whenever present.
C. They are indicated by lowercase letters.
D. They result in the trait of shortness in pea plants.
B. They are expressed whenever present.
Consider the following scenario:
In a certain dog breed, the allele B for a black coat is dominant, and the allele b for a spotted coat is recessive. What genotypes for this dog breed would lead to a spotted phenotype?
A. bb
B. BB
C. Bb
D. BB and bb