Questions and Answers
A dihybrid cross is mating between two individuals that are each ________ for ________ gene.
Heterozygous, two
A recessive allele is one whose effect is masked if a dominant allele is also present.
True
Which genotypes are possible in a gamete from an organism with genotype HhTt?
HT, Ht, hT, ht
Alternate forms of the same gene are called?
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Any monohybrid cross consisting of one dominant and one recessive allele for the trait being studied should result in a ratio of _______ dominant to ________ recessive phenotype.
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Gametes may carry different combinations of alleles because of?
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Genotype means?
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If an individual is heterozygous for a particular trait?
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Mendel's principle of segregation states that pairs of alleles are separated during meiosis in the formation of gametes.
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What do we mean when we use the term monohybrid cross and dihybrid cross?
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Study Notes
Genetics Concepts
- A dihybrid cross involves mating two individuals that are each heterozygous for two genes.
- Recessive alleles are masked by the presence of a dominant allele, making the statement about their relationship true.
- An organism with genotype HhTt can produce gametes with the following combinations: HT, Ht, hT, ht.
- Alleles are alternate forms of the same gene that can exist for traits such as head shape or tail length.
- In a monohybrid cross involving one dominant and one recessive allele, the expected phenotypic ratio is three dominant to one recessive.
- Gametes are diverse in allele combinations due to crossing over and random alignment of chromosomes during meiosis.
- The term genotype refers to the specific combination of alleles an individual possesses for a given trait.
- An individual that is heterozygous for a trait receives different alleles from each parent for that particular trait.
- Mendel's principle of segregation indicates that allele pairs are separated during meiosis when forming gametes, confirming the statement as true.
- A monohybrid cross studies one trait with two alleles, while a dihybrid cross involves two traits, each with different alleles, allowing for more complex inheritance patterns.
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Description
Test your knowledge on dihybrid crosses and alleles in this biology quiz. The questions cover key concepts such as heterozygosity, genotypes, and the nature of dominant and recessive alleles. Perfect for students wanting to reinforce their understanding of genetics.
