Question 1

Question

A)In pea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about phenotype and genotype is possible?(1 point)
Responses

If a plant has purple flowers, then its genotype must be Pp.
If a plant has purple flowers, then its genotype must be Pp .

If a plant has white flowers, then its genotype must be Pp.
If a plant has white flowers, then its genotype must be Pp .

If a plant has purple flowers, then its genotype must be PP.
If a plant has purple flowers, then its genotype must be PP .

If a plant has white flowers, then its genotype must be pp.
If a plant has white flowers, then its genotype must be pp .
Question 2
A)What is a phenotype of an organism?(1 point)
Responses

an observable trait
an observable trait

a structure that carries genetic information
a structure that carries genetic information

a section of DNA
a section of DNA

a combination of alleles
a combination of alleles
Question 3
A)What is an allele?(1 point)
Responses

a form of a gene
a form of a gene

the trait a gene controls
the trait a gene controls

the location of a gene on a chromosome
the location of a gene on a chromosome

a dominant form of a gene
a dominant form of a gene
Question 4
A)
Use the table to answer the question.

Plant A Plant B Plant C
tt TT Tt
The table shows the genotypes of three pea plants for the allele for height. Which prediction about the three plants is the most reasonable?

(1 point)
Responses

Plant A and Plant C will have similar heights.
Plant A and Plant C will have similar heights.

Plant A will be the tallest.
Plant A will be the tallest.

Plant B and Plant C will have similar heights.
Plant B and Plant C will have similar heights.

Plant C will be the shortest.

Answer 1

Here are the answers to your questions:

Question 1
The answer is:
If a plant has white flowers, then its genotype must be pp.
This is because white flowers (phenotype) can only result from having two recessive alleles (genotype pp).

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Question 2
The answer is:
an observable trait.
Phenotype refers to the observable characteristics or traits of an organism.

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Question 3
The answer is:
a form of a gene.
Alleles are different forms of a gene that can exist at a particular locus on a chromosome.

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Question 4
The answer is:
Plant A and Plant C will have similar heights.
Plant A (tt) is homozygous recessive for height, and Plant C (Tt) is heterozygous. Typically in pea plants, the dominant trait (T) determines tallness, so while Plant C will be taller than Plant A, they will likely be similar in height due to genetic factors associated with the "tt" genotype. Plant B (TT) will be the tallest.

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