The Theory Of The Gene by Thomas Hunt Morgan

1. What organism did Morgan use for his experiments?

A) Mice
B) Worms
C) Fruit flies (Drosophila melanogaster)
D) Peas

2. What did Morgan discover about genes?

A) They are found in the nucleus.
B) They are made of proteins.
C) They are inherited randomly.
D) They are located on chromosomes.

3. What term describes the observable traits of an organism?

A) Karyotype
B) Genotype
C) Phenotype
D) Allele

4. What does the term 'recombination' refer to?

A) The cloning process.
B) The mixing of species.
C) The re-assortment of genetic material during meiosis.
D) The alteration of DNA sequences.

5. What did the term 'crossing over' refer to?

A) The fusion of gametes.
B) The mutation in genes.
C) The separation of sister chromatids.
D) The exchange of genetic material between homologous chromosomes.

6. What is a linked gene?

A) A gene involved in epistasis.
B) A gene that is non-functional.
C) A gene located on the same chromosome as another gene.
D) A gene that has multiple alleles.

7. What type of inheritance pattern did Morgan study?

A) Codominance
B) Sex-linked inheritance
C) Incomplete dominance
D) Autosomal dominant

8. What is the significance of the concept of linkage?

A) All genes are unlinked.
B) Genes can change position on chromosomes.
C) Genes close together on a chromosome are inherited together.
D) Linkage causes mutations.

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