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Questions and Answers
What determines whether genes on the same chromosome will be inherited together?
What determines whether genes on the same chromosome will be inherited together?
- The number of genes on the chromosome
- The size of the chromosome
- The occurrence of crossing over (correct)
- The phenotypic traits involved
Which organism was used by Thomas Hunt Morgan to study gene linkage?
Which organism was used by Thomas Hunt Morgan to study gene linkage?
- Caenorhabditis elegans
- Escherichia coli
- Drosophila melanogaster (correct)
- Mus musculus
What is the primary reason genes can be inherited together according to gene linkage?
What is the primary reason genes can be inherited together according to gene linkage?
- They have similar phenotypes
- They are located on the same chromosome (correct)
- They are located on different chromosomes
- They have identical sequences
What does a chromosome consist of in the context of genetics?
What does a chromosome consist of in the context of genetics?
How did Morgan contribute to the understanding of Mendel's principles?
How did Morgan contribute to the understanding of Mendel's principles?
Which statement accurately reflects the inheritance of genes in linkage groups?
Which statement accurately reflects the inheritance of genes in linkage groups?
What characteristic of fruit flies made them an ideal model organism for genetic studies?
What characteristic of fruit flies made them an ideal model organism for genetic studies?
Why is it significant that almost all traits studied by Mendel were found on different chromosomes?
Why is it significant that almost all traits studied by Mendel were found on different chromosomes?
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Study Notes
Gene Linkage
- Some traits tend to be inherited together due to gene linkage.
- Gene linkage occurs when genes are located on the same chromosome and are inherited together.
- Thomas Hunt Morgan studied Drosophila melanogaster (fruit flies) to understand gene linkage.
- Fruit flies were chosen for their small size, ease of breeding, short generation time, and few chromosomes.
- Morgan discovered that genes on the same chromosome are generally inherited together.
- However, crossing over can separate linked genes, resulting in different combinations of traits.
- Mendel's principles were applied to fruit flies to study gene linkage.
- Most of Mendel's studied traits were located on different chromosomes, leading to independent assortment.
- A chromosome is essentially a group of linked genes.
- Genes within a linkage group are inherited together.
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