Podcast
Questions and Answers
Which of the following statements about Mendelian genetics is false?
Which of the following statements about Mendelian genetics is false?
- An individual inherits one allele from each parent for each gene
- Genes come in different versions called alleles
- The law of segregation states that each individual has two alleles for each gene and they segregate during gamete formation
- The dominant allele is always expressed over the recessive allele (correct)
What is the probability of two heterozygous parents producing an offspring with a homozygous recessive genotype?
What is the probability of two heterozygous parents producing an offspring with a homozygous recessive genotype?
- 50%
- 0%
- 75%
- 25% (correct)
In a dihybrid cross between two heterozygous individuals, what is the expected phenotypic ratio of the offspring?
In a dihybrid cross between two heterozygous individuals, what is the expected phenotypic ratio of the offspring?
- 1:2:1
- 9:3:3:1 (correct)
- 1:1:1:1
- 3:1
Which of the following is a correct statement about Mendelian genetics?
Which of the following is a correct statement about Mendelian genetics?
Which of the following is an example of a sex-linked trait?
Which of the following is an example of a sex-linked trait?
Which of the following is not a possible genotype of an individual with blood type AB?
Which of the following is not a possible genotype of an individual with blood type AB?
Flashcards
Dominant allele expression
Dominant allele expression
Dominant alleles don't always overshadow recessive alleles; it depends on the specific gene in question.
Probability of homozygous recessive offspring
Probability of homozygous recessive offspring
When both parents are heterozygous, there's a 25% chance their child will inherit two recessive alleles.
Dihybrid cross ratio
Dihybrid cross ratio
In a dihybrid cross, offspring have a 9:3:3:1 phenotypic ratio for two traits.
Epistasis in genetics
Epistasis in genetics
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Sex-linked trait example
Sex-linked trait example
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Possible AB blood type genotype
Possible AB blood type genotype
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Study Notes
Mendelian Genetics
- Principle of Segregation: Each individual carries two alleles for each trait, and these alleles separate during gamete formation.
- Principle of Independent Assortment: Alleles for different traits are inherited independently.
- Phenotypic ratio: The ratio of different physical appearances in offspring.
- Genotypic Ratio: The ratio of different genetic combinations in offspring.
- Homozygous: Both alleles for a trait are the same
- Heterozygous: Alleles for a trait are different
- Recessive allele: Only expressed when two copies are present.
- Dominant allele: Expressed even when only one copy is present
Probability of Offspring Genotype
- Probability of a homozygous recessive offspring: 1/4 (25%)
Dihybrid Cross Phenotype
- Expected Phenotypic Ratio: 9:3:3:1
Sex-linked traits
- Traits determined by genes located on sex chromosomes (X or Y).
- Example: Hemophilia and red-green color blindness
- X-linked traits: Traits determined by genes located on the X chromosome
- Y-linked traits: Traits determined by genes located on the Y chromosome
Blood Type AB
- Possible Genotypes: I^A I^B
- Blood type AB: Individuals inherit one I^A allele from one parent and one I^B allele from the other parent.
- Codominance: Both alleles are expressed, resulting in a unique phenotype.
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