Question
What determines a trait of an organism?(1 point)
Responses
the number of dominant alleles
the number of dominant alleles
the number of copies of the gene
the number of copies of the gene
the combination of its alleles
the combination of its alleles
its phenotype
To determine a trait of an organism, you should look at its phenotype. The phenotype is the physical manifestation or observable characteristics of the organism, such as its appearance, behavior, or other traits. These traits are a result of the combination of alleles that the organism has inherited.
Alleles are different forms or variants of a gene, which are located at specific positions on the chromosomes. Each gene typically has two alleles, one inherited from each parent. These alleles can be dominant or recessive.
The combination of alleles an organism has can determine its trait. Dominant alleles are expressed in the phenotype, while recessive alleles are only expressed if an organism has two copies of the recessive allele. For example, if an organism has one dominant allele and one recessive allele for a particular trait, it will exhibit the dominant trait. However, if an organism has two recessive alleles for a particular trait, it will exhibit the recessive trait.
Therefore, it is the combination of alleles an organism possesses that determines its trait. By examining an organism's phenotype, we can often infer the underlying combination of alleles that is responsible for the observable traits.
Which statement is accurate about dominant alleles?(1 point)
Responses
They are expressed only when a recessive allele is not present.
They are expressed only when a recessive allele is not present.
They are expressed whenever present.
They are expressed whenever present.
They result in the trait of shortness in pea plants.
They result in the trait of shortness in pea plants.
They are indicated by lowercase letters.
They are expressed whenever present.
The combination of its alleles determines a trait of an organism.
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?
(1 point)
Responses
BB and bb
BB and bb
BB
BB
Bb
Bb
bb
The genotype that would lead to a spotted phenotype in this dog breed is bb.
Question
A Punnett square is a mathematical model of genetic outcomes based on which of these?(1 point)
Responses
probability
probability
exact outcomes
exact outcomes
genetic markers
genetic markers
traits of prior offspring
probability
What is the main benefit of genetic biodiversity?(1 point)
Responses
Genetic biodiversity helps populations adapt to environmental changes.
Genetic biodiversity helps populations adapt to environmental changes.
Genetic biodiversity helps populations avoid predators.
Genetic biodiversity helps populations avoid predators.
Genetic biodiversity helps individuals produce more offspring.
Genetic biodiversity helps individuals produce more offspring.
Genetic biodiversity helps individuals compete with each other.