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Questions and Answers
What is the genotype of a male who expresses a sex-linked recessive trait?
What is the genotype of a male who expresses a sex-linked recessive trait?
- Heterozygous Xa
- Homozygous Xa
- Hemizygous Xa (correct)
- Homozygous XA
What is the probability that a son inherits an X-linked recessive allele from a carrier mother?
What is the probability that a son inherits an X-linked recessive allele from a carrier mother?
- 25%
- 50% (correct)
- 100%
- 75%
What is the notation for an X-linked dominant allele?
What is the notation for an X-linked dominant allele?
- XxA
- XA (correct)
- Xa
- XAX
A female who is homozygous for an X-linked dominant allele will transmit the allele to which of her offspring?
A female who is homozygous for an X-linked dominant allele will transmit the allele to which of her offspring?
What is the term used to describe males who have only one X chromosome in relation to sex-linked genes?
What is the term used to describe males who have only one X chromosome in relation to sex-linked genes?
A male who is affected by an X-linked recessive trait will transmit the allele to which of his offspring?
A male who is affected by an X-linked recessive trait will transmit the allele to which of his offspring?
What is the probability that a child will have the trait if a carrier mates with a male who has the trait?
What is the probability that a child will have the trait if a carrier mates with a male who has the trait?
What is the name of the gene on the human X chromosome that causes Duchenne muscular dystrophy?
What is the name of the gene on the human X chromosome that causes Duchenne muscular dystrophy?
What is the name of the coagulation factor IX gene on the human X chromosome that causes Haemophilia B?
What is the name of the coagulation factor IX gene on the human X chromosome that causes Haemophilia B?
What is the notation for the genotype of a carrier female who has one copy of the X-linked recessive allele?
What is the notation for the genotype of a carrier female who has one copy of the X-linked recessive allele?
What is the proportion of males affected by Haemophilia A?
What is the proportion of males affected by Haemophilia A?
Why do many more males than females have sex-linked disorders?
Why do many more males than females have sex-linked disorders?
What is the expected phenotypic ratio if the genes controlling body colour and wing size are genetically unlinked?
What is the expected phenotypic ratio if the genes controlling body colour and wing size are genetically unlinked?
Why are the recombinant phenotypes underrepresented in Morgan's experiment?
Why are the recombinant phenotypes underrepresented in Morgan's experiment?
What is the primary difference between Morgan's experiment and Mendel's dihybrid crosses in pea plants?
What is the primary difference between Morgan's experiment and Mendel's dihybrid crosses in pea plants?
What is the purpose of studying genetic linkage in Drosophila melanogaster?
What is the purpose of studying genetic linkage in Drosophila melanogaster?
What increases the likelihood of recombination between linked genes?
What increases the likelihood of recombination between linked genes?
What can be inferred about the genes controlling body colour and wing size in Drosophila melanogaster?
What can be inferred about the genes controlling body colour and wing size in Drosophila melanogaster?
What is the primary purpose of the fluorescent yellow dye in the image?
What is the primary purpose of the fluorescent yellow dye in the image?
What was the significant discovery made by Thomas Hunt Morgan in the 1900s?
What was the significant discovery made by Thomas Hunt Morgan in the 1900s?
What is the main concept that explains how genes are inherited?
What is the main concept that explains how genes are inherited?
What is the term for a segment of DNA that carries information necessary for the development of an organism?
What is the term for a segment of DNA that carries information necessary for the development of an organism?
What is the term for a variation of a gene that results in a different phenotype?
What is the term for a variation of a gene that results in a different phenotype?
What is the organism that was used by Thomas Hunt Morgan to study the chromosomal basis of inheritance?
What is the organism that was used by Thomas Hunt Morgan to study the chromosomal basis of inheritance?
What is the genotype of the wild type Drosophila melanogaster female in the experiment?
What is the genotype of the wild type Drosophila melanogaster female in the experiment?
What is the phenotype of the offspring if the genes for body colour and wing size are not linked?
What is the phenotype of the offspring if the genes for body colour and wing size are not linked?
What is the purpose of crossing the wild type female with a male that has both mutant phenotypes in the experiment?
What is the purpose of crossing the wild type female with a male that has both mutant phenotypes in the experiment?
What is the notation for the mutant allele of the body colour gene?
What is the notation for the mutant allele of the body colour gene?
Why are the genes for body colour and wing size not sex-linked in Drosophila melanogaster?
Why are the genes for body colour and wing size not sex-linked in Drosophila melanogaster?
What is the result of the experiment performed by Thomas Hunt Morgan and his team?
What is the result of the experiment performed by Thomas Hunt Morgan and his team?
