Chromosomal Inheritance

What foundational work is the video on chromosomal inheritance built upon?

• Watson and Crick's DNA model

• Thomas Hunt Morgan's chromosomal theory

• Charles Darwin's theory of evolution

• Gregor Mendel's work on pea plants

In a monohybrid cross, what is the expected phenotypic ratio in the F2 generation?

• 1:1

• 3:1

• 9:3:3:1

• 1:2:1

During meiosis, how many gametes are produced from one cell?

• Four

• Eight

• Two

• Six

What is the main question Mendel faced in dihybrid crosses?

• Whether genes are linked or independent

• How many chromosomes are in a cell

• The structure of DNA

• The role of dominant and recessive alleles

In a dihybrid cross, what phenotypic ratio is expected if genes are independent?

• 1:1

• 9:3:3:1

• 3:1

• 1:2:1

What organism did Thomas Hunt Morgan use for his genetic experiments?

• Pea plants

• Fruit flies

• Mice

• Bacteria

What unexpected result did Morgan find in his fruit fly experiments?

• 100% parental types

• 50% recombinants

• 83% recombinants

• 17% recombinants

What concept explains the production of recombinants in Morgan's experiments?

• Independent assortment

• Mutation

• Crossing over

• Gene linkage

What did Morgan's experiments reveal about Mendel's model?

• It was irrelevant to modern genetics

• It needed revision to include chromosomal behavior

• It only applied to plants

• It was completely accurate

What is the significance of understanding genetics at the level of Morgan?

• It focuses solely on dominant traits

• It provides insight into DNA replication

• It explains the structure of chromosomes

• It highlights the role of crossing over in genetic variation