Podcast
Questions and Answers
In diploid organisms, a gene locus is considered homozygous when:
In diploid organisms, a gene locus is considered homozygous when:
- No alleles are present.
- Only one allele is present.
- Two identical alleles are present. (correct)
- Two different alleles are present.
If 'R' represents a dominant allele for round seeds and 'r' represents a recessive allele for wrinkled seeds, what is the genotype of a heterozygous plant?
If 'R' represents a dominant allele for round seeds and 'r' represents a recessive allele for wrinkled seeds, what is the genotype of a heterozygous plant?
- Rr (correct)
- R or r
- RR
- rr
Assuming brown coat color (B) is dominant over white coat color (b) in flying hamsters, what phenotype would a hamster with the genotype 'BB' exhibit?
Assuming brown coat color (B) is dominant over white coat color (b) in flying hamsters, what phenotype would a hamster with the genotype 'BB' exhibit?
- A mix of brown and white
- Unpredictable coat color
- Brown coat (correct)
- White coat
If brown hamsters consistently produce brown offspring when mated with each other, and white hamsters consistently produce white offspring when mated with each other, what can be inferred about the parental hamsters' genotypes for coat color?
If brown hamsters consistently produce brown offspring when mated with each other, and white hamsters consistently produce white offspring when mated with each other, what can be inferred about the parental hamsters' genotypes for coat color?
A flying hamster displays a white coat phenotype. If white coat color is recessive, which of the following genotypes is most likely for this hamster?
A flying hamster displays a white coat phenotype. If white coat color is recessive, which of the following genotypes is most likely for this hamster?
When a homozygous brown hamster (BB) is crossed with a homozygous white hamster (bb), and all progeny are brown, what is the genotype of these progeny?
When a homozygous brown hamster (BB) is crossed with a homozygous white hamster (bb), and all progeny are brown, what is the genotype of these progeny?
In a genetic cross between homozygous brown and homozygous white hamsters, all offspring are brown. This observation indicates that:
In a genetic cross between homozygous brown and homozygous white hamsters, all offspring are brown. This observation indicates that:
Adrian crosses a true-breeding brown hamster with a true-breeding white hamster. All of their offspring are brown. This outcome suggests:
Adrian crosses a true-breeding brown hamster with a true-breeding white hamster. All of their offspring are brown. This outcome suggests:
What is the defining characteristic of a 'true-breeding' population of organisms for a specific trait?
What is the defining characteristic of a 'true-breeding' population of organisms for a specific trait?
According to the principles of Mendelian genetics described, a dominant trait is best defined as a trait that is:
According to the principles of Mendelian genetics described, a dominant trait is best defined as a trait that is:
In genetic inheritance, the concept of dominance explains that:
In genetic inheritance, the concept of dominance explains that:
Conversely, a recessive trait, in the context of these genetic principles, is best defined as a trait that is:
Conversely, a recessive trait, in the context of these genetic principles, is best defined as a trait that is:
If 'B' is the dominant allele for brown coat color and 'b' is the recessive allele for white coat color, which cross would exclusively produce brown coat colored offspring?
If 'B' is the dominant allele for brown coat color and 'b' is the recessive allele for white coat color, which cross would exclusively produce brown coat colored offspring?
In standard genetic notation, how are dominant and recessive alleles typically represented to distinguish them?
In standard genetic notation, how are dominant and recessive alleles typically represented to distinguish them?
Adrian's hypothesis is that hamster coat color is determined by a single locus. How does the outcome of the initial cross (BB x bb resulting in all brown Bb progeny) support this hypothesis?
Adrian's hypothesis is that hamster coat color is determined by a single locus. How does the outcome of the initial cross (BB x bb resulting in all brown Bb progeny) support this hypothesis?
Flashcards
Homozygous
Homozygous
Having two identical alleles at a specific gene locus.
Heterozygous
Heterozygous
Having two different alleles at a specific gene locus.
Phenotype
Phenotype
The observable characteristics of an organism resulting from the interaction of its genotype with the environment.
Genotype
Genotype
Signup and view all the flashcards
Allele
Allele
Signup and view all the flashcards
Dominant Allele
Dominant Allele
Signup and view all the flashcards
Recessive Allele
Recessive Allele
Signup and view all the flashcards
True Breeding
True Breeding
Signup and view all the flashcards
Dominant Trait
Dominant Trait
Signup and view all the flashcards
Recessive Trait
Recessive Trait
Signup and view all the flashcards
Study Notes
- In diploid organisms, there are two copies of every gene.
- Different versions of a gene are called alleles.
- Coat color gene is represented by the letter 'B', with uppercase 'B' and lowercase 'b' representing different alleles.
- Flying hamsters are diploid, and can have two copies of the same allele ('BB' or 'bb') or one of each ('Bb').
- A locus with two different alleles is heterozygous.
- A locus with two copies of the same allele is homozygous.
Translating Genotype into Phenotype
- Coat color of hamsters is determined by a single locus.
- 'B' allele represents brown, 'b' represents white.
- 'BB' genotype results in a brown hamster.
- 'bb' genotype results in a white hamster.
Dominant and Recessive Genes
- Brown hamster bred with a white hamster produces only brown hamsters.
- One trait can be dominant over another.
- Brown hamsters mating with brown hamsters always produce brown hamsters.
- White hamsters mating with white hamsters always produce white hamsters.
- Parent hamsters come from "true breeding" populations.
- True breeding means that brown hamsters mated with brown hamsters always produce more brown hamsters, and white hamsters with white hamsters always produce white hamsters.
- Genotype of the brown hamsters is 'BB' and the white hamsters is 'bb'.
- Progeny from the cross have a 'Bb' genotype.
- All hamsters in the progeny generation are brown, indicating that the brown allele is dominant over the white allele.
- A dominant trait is expressed in the heterozygous state.
- A recessive trait is not expressed in the heterozygous state.
- Geneticists represent the dominant allele with a capital letter and the recessive allele with a lower case letter.
- Flying hamster coat color is determined by a single locus.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Understand genotypes and phenotypes in diploid organisms. Learn about alleles, heterozygous and homozygous loci. Explore coat color inheritance in hamsters, and the concepts of dominant and recessive genes.
