
Mendelian Genetics
Quiz by Laura Sebile
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13 questions
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- Q1What is the genotype of an organism that displays a dominant phenotype but is unknown whether it is homozygous or heterozygous?Both homozygous and heterozygousIt is unknownHomozygousHeterozygous30s
- Q2What principle states that the alleles for different traits are distributed to gametes independently of one another?The Law of SegregationThe Law of DominanceThe Law of Independent AssortmentThe Principle of Uniformity30s
- Q3Which of the following best describes a phenotype?The genetic makeup of an organismThe number of chromosomes in the organismThe observable traits of an organismThe type of alleles present30s
- Q4If a pea plant with the genotype Tt (tall) is crossed with a plant with the genotype tt (short), what is the probability that the offspring will be tall?75%100%50%25%30s
- Q5In a dihybrid cross, what is the expected phenotypic ratio of the offspring when two heterozygous parents are crossed (TtYy x TtYy)?9:3:3:11:1:1:11:2:13:130s
- Q6What does it mean if an allele is described as dominant?It cannot be inheritedIt is always expressedIt masks the effect of the other allele in a heterozygous conditionIt is only expressed in homozygous conditions30s
- Q7Which of the following is a key concept of Mendel's law of segregation?Genes are unlinkedAlleles separate during gamete formationPhenotypes blend togetherAll offspring inherit two alleles from each parent30s
- Q8What is the term for an organism's genetic makeup?TraitPhenotypeGenotypeAllele30s
- Q9What does it mean if an individual is homozygous for a trait?They express only the dominant traitThey have no alleles for that traitThey have two identical alleles for that traitThey have two different alleles for that trait30s
- Q10Which process involves the exchange of genetic material between homologous chromosomes during meiosis?SegregationIndependent assortmentRandom fertilizationCrossing over30s
- Q11Which term describes different forms of a gene that can exist at a specific locus?PhenotypesAllelesChromosomesGenotypes30s
- Q12According to Mendel's first law, what must occur for different traits to segregate independently during gamete formation?The traits must be linkedThe traits must be identicalThe genes must be on different chromosomesThe alleles must be dominant30s
- Q13What is the phenotype of an organism?The observable traits expressed by the organismThe alleles it carriesThe number of chromosomes in its cellsThe genetic makeup of the organism30s