How Would One Explain a Testcross Involving F₁ Dihybrid Flies

question 42

Multiple Choice

How would one explain a testcross involving F₁ dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced?

• A)The two genes are linked.
• B)The two genes are linked but on different chromosomes.
• C)Recombination did not occur in the cell during meiosis.
• D)The testcross was improperly performed.
• E)Both of the characters are controlled by more than one gene.

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Definitions:

Relieving Triangle

In Mycenaean architecture, the triangular opening above the lintel that serves to lighten the weight to be carried by the lintel itself.

Dromos

The passage leading to a tholos tomb.

Lintel

A horizontal support across the top of a door or window, often used in architecture to bear the weight of the structure above.

Old Palace Period

A phase in Minoan civilization, characterized by the construction of large administrative and ceremonial centers on Crete, dating from circa 1900 to 1700 BCE.