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Genetics Fundamentals and Mendelian Inheritance

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Termini in questo insieme (20)

  • What is an allele in genetics?

    An allele is a variant form of a gene at a specific locus on a chromosome.

  • Define a gene in genetics.

    A gene is a unit of heredity that carries information for a specific trait and is made up of DNA.

  • What is Mendelian Monohybrid Inheritance?

    Inheritance pattern involving a single gene with two alleles, demonstrating dominance and segregation of alleles.

  • Explain the concept of dominance in Mendelian inheritance.

    Dominance occurs when one allele masks the expression of another allele at the same locus.

  • What does segregation mean in Mendelian genetics?

    Segregation is the separation of alleles during gamete formation so each gamete carries only one allele.

  • Name exceptions to Mendelian Monohybrid inheritance.

    Exceptions include lethal genes, co-dominance, incomplete dominance, and haploinsufficiency.

  • What is co-dominance?

    Co-dominance is when both alleles in a heterozygote are fully expressed, producing a distinct phenotype for each.

  • Define incomplete dominance.

    Incomplete dominance occurs when the heterozygote shows an intermediate phenotype between the two homozygotes.

  • What is haploinsufficiency?

    Haploinsufficiency is when a single functional copy of a gene is insufficient to produce a normal phenotype.

  • Describe Mendelian Dihybrid Inheritance.

    Inheritance involving two genes with independent assortment of alleles, producing a 9:3:3:1 phenotypic ratio in F2.

  • What is the principle of independent assortment?

    Alleles of different genes assort independently during gamete formation, leading to genetic variation.

  • Explain recessive epistasis.

    Recessive epistasis occurs when the recessive allele of one gene masks the expression of alleles of another gene.

  • What is dominant epistasis?

    Dominant epistasis happens when a dominant allele of one gene masks the expression of alleles of another gene.

  • Define an inhibitory gene in genetics.

    An inhibitory gene suppresses the expression of another gene, affecting phenotype.

  • What are multiple alleles?

    Multiple alleles refer to more than two alternative forms of a gene that can occupy the same locus.

  • Give an example of multiple alleles in humans.

    The human blood group system (ABO) is a classic example involving multiple alleles.

  • How do major and minor blood group genes interact?

    They interact through dominance, co-dominance, and epistatic interactions to determine blood group phenotypes.

  • What is cytoplasmic inheritance?

    Cytoplasmic inheritance is the transmission of genetic material through cytoplasm, often maternally inherited.

  • Give an example of cytoplasmic inheritance in Paramecia.

    Kappa particles in Paramecia are cytoplasmic elements inherited maternally.

  • What is the significance of shell coiling in Limnea?

    Shell coiling in Limnea is an example of maternal inheritance through cytoplasmic factors.