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Questions and Answers
What genotype represents the brown hamsters in true breeding populations?
What genotype represents the brown hamsters in true breeding populations?
- bb
- BB (correct)
- Bb
- B
What will be the genotype of the progeny from a brown hamster and a white hamster cross?
What will be the genotype of the progeny from a brown hamster and a white hamster cross?
- Bb (correct)
- bb
- BB
- B
Why do all the progeny from the brown and white hamster cross show a brown coat color?
Why do all the progeny from the brown and white hamster cross show a brown coat color?
- The brown allele is recessive.
- The brown allele is dominant. (correct)
- Both alleles are codominant.
- The white allele is dominant.
How is a dominant trait typically represented in genetic notation?
How is a dominant trait typically represented in genetic notation?
In the context of the given content, what is the expected phenotype of a heterozygous hamster?
In the context of the given content, what is the expected phenotype of a heterozygous hamster?
What conclusion can be drawn about the trait for hamster coat color from the experiment?
What conclusion can be drawn about the trait for hamster coat color from the experiment?
Which genotype represents the white hamsters in true breeding populations?
Which genotype represents the white hamsters in true breeding populations?
What does the term heterozygous refer to in the context of the flying hamster’s coat color?
What does the term heterozygous refer to in the context of the flying hamster’s coat color?
If a flying hamster has the genotype 'bb', what color will its coat be?
If a flying hamster has the genotype 'bb', what color will its coat be?
What type of genetic relationship is illustrated by the brown and white hamsters always producing brown offspring?
What type of genetic relationship is illustrated by the brown and white hamsters always producing brown offspring?
What is the possible genotype for a brown flying hamster?
What is the possible genotype for a brown flying hamster?
In diploid organisms like flying hamsters, how many alleles does each gene have?
In diploid organisms like flying hamsters, how many alleles does each gene have?
If a brown hamster is crossed with a heterozygous hamster ('Bb'), what are the possible genotypes for the offspring?
If a brown hamster is crossed with a heterozygous hamster ('Bb'), what are the possible genotypes for the offspring?
Which allele in the flying hamsters is considered dominant?
Which allele in the flying hamsters is considered dominant?
What would be the expected phenotype of the offspring from two white hamsters (‘bb’)?
What would be the expected phenotype of the offspring from two white hamsters (‘bb’)?
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Study Notes
Diploid Organisms
- Diploid organisms have two copies of each gene.
- Different versions of the same gene are called alleles.
- Homozygous: An organism has two copies of the same allele.
- Heterozygous: An organism has two different alleles.
Example of Allele Representation
- B: Represents the coat color gene.
- BB: Represents two brown alleles.
- bb: Represents two white alleles.
- Bb: Represents one brown and one white allele.
Genotype and Phenotype
- Genotype refers to the genetic makeup of an organism.
- Phenotype refers to the observable traits of an organism.
Dominant and Recessive Traits
- Dominant Allele: The trait is expressed in the heterozygous state.
- Recessive Allele: The trait is not expressed in the heterozygous state.
- True Breeding: Organisms that always produce offspring with the same trait when mated with each other.
Experiment Findings
- A brown hamster crossed with a white hamster produced only brown offspring.
- This indicates that the brown allele is dominant over the white allele.
- The brown hamster was homozygous (BB) and the white hamster was homozygous (bb).
- The offspring were all heterozygous (Bb) and expressed the dominant brown coat color.
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