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Questions and Answers
Which of these genotypes represents a homozygous recessive condition in a spider?
Which of these genotypes represents a homozygous recessive condition in a spider?
A spider with the genotype V1V3 will exhibit high silk flexibility.
A spider with the genotype V1V3 will exhibit high silk flexibility.
True (A)
What is the term for the observable traits of an organism, such as high silk flexibility or no silk?
What is the term for the observable traits of an organism, such as high silk flexibility or no silk?
Phenotype
A Punnett square is a tool used to predict the possible ______ of offspring.
A Punnett square is a tool used to predict the possible ______ of offspring.
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Match the following terms to their respective definitions:
Match the following terms to their respective definitions:
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If a spider inherits V1V3 and V1V3 from its parents, it will definitely have no silk.
If a spider inherits V1V3 and V1V3 from its parents, it will definitely have no silk.
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Study Notes
Gene Expression and Inheritance
- Alleles: Different versions of a gene, controlling traits. Examples include V1 (dominant, high silk flexibility) and V3 (recessive, no silk).
- Genotype: The organism's genetic makeup (e.g., V1V1, V1V3, V3V3).
- Phenotype: The observable trait (e.g., high silk flexibility, no silk), determined by the genotype.
- Dominant Traits: Expressed even with only one copy of the dominant allele present.
- Recessive Traits: Expressed only when two copies of the recessive allele are present.
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Homozygous: Having two identical alleles for a gene.
- Homozygous Dominant: Two copies of the dominant allele (e.g., V1V1).
- Homozygous Recessive: Two copies of the recessive allele (e.g., V3V3).
- Heterozygous: Having two different alleles for a gene (e.g., V1V3).
- Punnett Squares: Tools used to predict possible genotypes of offspring from parents with known genotypes. A cross between two V1V3 spiders has a 25% chance of V1V1, 50% chance of V1V3, and a 25% chance of V3V3 offspring.
- Autosomal Inheritance: Passing traits not linked to sex chromosomes (Y/X).
- Mendelian Genetics: Rules governing trait inheritance. Dominant traits mask recessive ones when both are present.
Silk Production Example
- V1 allele: Causes high silk flexibility (dominant).
- V3 allele: Causes no silk (recessive).
- Genotype-Phenotype Relationship: Genotypes (V1V1, V1V3, V3V3) determine corresponding phenotypes (high silk flexibility, high silk flexibility, no silk respectively).
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Description
Test your knowledge on alleles, genotypes, and phenotypes with this quiz focused on gene expression and inheritance. Understand dominant and recessive traits, as well as the concepts of homozygosity, heterozygosity, and Punnett squares. Perfect for biology students looking to reinforce their learning!
