. 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? **Make a punnet square for help**(1 point)

Question

Responses

some round and some wrinkled
some round and some wrinkled

slightly wrinkled
slightly wrinkled

round
round

wrinkled

Answer 1

To determine the phenotype of a pea plant with the genotype Rr, we can create a Punnett square. Since R (round) is dominant over r (wrinkled), any allele combination that includes at least one R will display the round phenotype.

Here’s how the Punnett square looks:

       R        r
    ----------------
R |   RR     |  Rr   |
    ----------------
r |   Rr     |  rr   |
    ----------------

From the Punnett square, we can see the following possible genotypes for the offspring:

• RR (homozygous dominant) — round
• Rr (heterozygous) — round
• Rr (heterozygous) — round
• rr (homozygous recessive) — wrinkled

Now let's summarize the phenotypes:

• 3 out of 4 offspring will have round peas (RR or Rr)
• 1 out of 4 offspring will have wrinkled peas (rr)

Since the question is asking about the phenotype of a pea plant with a specific genotype of Rr, the phenotype is round.

The correct response is:

round

Answer 2

What determines a trait of an organism?(1 point)
Responses

the number of dominant alleles
the number of dominant alleles

its phenotype
its phenotype

the combination of its alleles
the combination of its alleles

the number of copies of the gene

Answer 3

The trait of an organism is determined by the combination of its alleles. The alleles can be dominant or recessive, and how they interact (e.g., being homozygous or heterozygous) determines the organism's phenotype (physical expression of that trait).

So, the correct response is:

the combination of its alleles.

Answer 4

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 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 indicated by lowercase letters.

They are expressed whenever present.

Answer 5

The accurate statement about dominant alleles is:

They are expressed whenever present.

Dominant alleles will express their trait even if only one copy is present, as they mask the effect of recessive alleles.

Answer 6

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? **Make a Punnet square for help**(1 point)
Responses

BB
BB

Bb
Bb

BB and bb
BB and bb

bb

Answer 7

In order for a dog to have a spotted phenotype (which is represented by the recessive allele b), it must have the genotype bb (homozygous recessive).

We can also create a Punnett square to illustrate the inheritance:

Let's set up a Punnett square assuming a cross between two dog genotypes: one is heterozygous (Bb) and the other is homozygous recessive (bb).

       B        b
    ----------------
b |   Bb     |  bb   |
    ----------------
b |   Bb     |  bb   |
    ----------------

From this Punnett square:

• The genotypes produced are Bb (black coat) and bb (spotted coat).
• The spotted phenotype (bb) appears when the dog has two recessive alleles.

Thus, the only genotype that leads to a spotted phenotype is:

bb.

So, the correct response is:

bb.

Answer 8

hich statement is true of all proteins?(1 point)
Responses

They are created by mutations in DNA.
They are created by mutations in DNA.

They carry oxygen in human blood.
They carry oxygen in human blood.

Their main function is to cause mutations.
Their main function is to cause mutations.

Their structure is related to their function.

Answer 9

The true statement about all proteins is:

Their structure is related to their function.

Proteins have specific structures that determine their functions in biological processes. The shape of a protein is critical for its role in the body, whether it's an enzyme, a structural component, a transport molecule, or involved in immune responses.

Answer 10

What is the main benefit of genetic biodiversity?(1 point)
Responses

Genetic biodiversity helps individuals compete with each other.
Genetic biodiversity helps individuals compete with each other.

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 populations adapt to environmental changes.

Answer 11

The main benefit of genetic biodiversity is:

Genetic biodiversity helps populations adapt to environmental changes.

Genetic diversity within a population provides a greater range of traits that may enable some individuals to survive and reproduce under changing environmental conditions, which is essential for the long-term survival of species.