Based on the Classic Experiments of Creighton and McClintock with Maize,crossing

question 21

Multiple Choice

Based on the classic experiments of Creighton and McClintock with maize,crossing over involves a physical exchange between chromatids.What particular chromosomal characteristic allowed their experiments to succeed?

• A) colored bands along the lengths of a chromosome
• B) an extra chromosome
• C) a missing chromosome
• D) three chromosomes with identical structure
• E) a chromosome with a unique cytological marker

---

Definitions:

Beriberi

A disease resulting from lack of vitamin B1, thiamine.

Vitamin B

A group of water-soluble vitamins that play significant roles in cell metabolism.

Thiamine

A water-soluble B vitamin (B1) essential for glucose metabolism and normal nerve, muscle, and heart function.

Amenorrhea

Absence of menses; without menstruation.