Linked Genes

The video tutorial explains the concept of linked genes, primarily through the work of Thomas Hunt Morgan and his experiments with fruit flies. It covers the setup of genetic experiments, the process of crossbreeding, and the analysis of results that led to the discovery of linked genes. The tutorial also discusses chromosomal genetics and the creation of gene maps, highlighting the contributions of Morgan and his student Sturtevant.

Who was primarily responsible for the discovery of linked genes through experiments with fruit flies?

• James Watson

• Thomas Hunt Morgan

• Charles Darwin

• Gregor Mendel

What is the significance of the 'bl bl' notation in fruit fly genetics?

• It represents a wild type gene.

• It indicates a black mutation.

• It is a notation for a dominant trait.

• It stands for a vestigial wing mutation.

In a genetic cross, what would you expect if both traits are recessive?

• The offspring will display the mutant type.

• The offspring will not survive.

• The offspring will display the wild type.

• The offspring will have a combination of traits.

What unexpected result did Thomas Hunt Morgan observe in his genetic crosses?

• Equal distribution of all traits.

• More parental types than recombinants.

• No offspring produced.

• All offspring were mutants.

What does it mean when genes are described as 'linked'?

• They cannot undergo recombination.

• They are always dominant.

• They are located on the same chromosome.

• They are located on different chromosomes.

What is the relationship between recombination frequency and gene distance?

• Lower frequency indicates closer genes.

• Higher frequency indicates closer genes.

• Frequency does not relate to gene distance.

• Frequency is always 50% for linked genes.

What is the recombination frequency if genes are on different chromosomes?

• 100%

• 0%

• 17%

• 50%

How can recombination frequency be used in genetics?

• To determine the dominance of a gene.

• To create a gene map.

• To predict offspring gender.

• To identify mutations.

What did Sturtevant contribute to the study of linked genes?

• He disproved Mendelian genetics.

• He developed the concept of gene mapping.

• He discovered chromosomes.

• He identified the first mutation.

What is an example of linked genes in humans?

• Skin tone and eye color

• Eye color and height

• Freckles and red hair

• Blood type and hair color