These questions will help you review what you have learned about the differences between heterozygous and homozygous chromosomes. They will also help you remember the difference between phenotype and genotype.
Traits such as cleft chin, dimples, straight hairlines, and attached ear lobes are called _________.
- genotypes
- phenotypes
- prototypes
Visible characteristics are caused by genotypes that we cannot see.
Visible characteristics are caused by genotypes that we cannot see.
Visible characteristics are caused by genotypes that we cannot see.
A tall pea plant must have a genotype of identical or non-identical dominant alleles. T is a dominant allele, and t is a recessive allele. Which among the following is a homozygous allele that that causes the production of tall pea plants?
- Tt
- TT
- tt
Non-identical alleles are not homozygous alleles. Only dominant alleles can cause tall plants. The homozygous recessive alleles produce short plants.
Non-identical alleles are not homozygous alleles. Only dominant alleles can cause tall plants. The homozygous recessive alleles produce short plants.
Non-identical alleles are not homozygous alleles. Only dominant alleles can cause tall plants. The homozygous recessive alleles produce short plants.
Which is an example of a heterozygous allele?
- Aa
- aa
- AA
Heterozygous alleles are non-identical alleles or genes.
Heterozygous alleles are non-identical alleles or genes.
Heterozygous alleles are non-identical alleles or genes.
A is the dominant allele for a widow's peak hairline trait, and a is the recessive allele for straight hairline trait. What type of alleles are responsible for expressing the phenotype of widow's peak in an individual?
- Aa - heterozygous non-identical alleles
- AA - homozygous identical alleles
- aa - homozygous identical alleles
- Answers A and B
- Answers A and C
Only heterozygous dominant alleles or homozygous identical dominant alleles can produce this trait.
Only heterozygous dominant alleles or homozygous identical dominant alleles can produce this trait.
Only heterozygous dominant alleles or homozygous identical dominant alleles can produce this trait.
Only heterozygous dominant alleles or homozygous identical dominant alleles can produce this trait.
Only heterozygous dominant alleles or homozygous identical dominant alleles can produce this trait.
Which of these images shows the phenotype of this genotype: a homozygous AA purple-flowered pea plant?
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| Image 1 | Image 2 |
- Image 1
- Image 2
- Neither Image
- Both Images
Two homozygous (identical) dominant alleles will produce a purple pea plant.
Two homozygous (identical) dominant alleles will produce a purple pea plant.
Two homozygous (identical) dominant alleles will produce a purple pea plant.
Two homozygous (identical) dominant alleles will produce a purple pea plant.
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