The Theory Of The Gene by Thomas Hunt Morgan

1. What organism did Morgan use for his experiments?

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

2. What did Morgan discover about genes?

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

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

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

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

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

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

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

6. What is a linked gene?

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

7. What type of inheritance pattern did Morgan study?

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

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

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

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