What does the Ericsson Method assume about sperm movement?

• A. Sperm with larger Y chromosomes swim faster
• B. Sperm with smaller Y chromosomes swim faster
• C. Sperm with X chromosomes are more resilient
• D. Sperm movement is unaffected by chromosome type

Answer: (B)

The Ericsson Method assumes that sperm with smaller Y chromosomes swim faster than those with larger chromosomes. This is based on the premise that the physical characteristics of the sperm, including the chromosome type, can influence their motility. The method is often applied in the context of selecting for male offspring, where the idea is that Y chromosome-bearing sperm have certain advantages in terms of speed and agility.

Sperm that carry the Y chromosome are believed to be more streamlined and therefore capable of quicker movement compared to their X chromosome counterparts. This belief forms the basis of some gender selection techniques where the goal is to increase the likelihood of conceiving a boy.

In contrast, the other choices present notions that are not consistent with the foundational principles of the Ericsson Method. For instance, options suggesting that X chromosomes are more resilient or that sperm movement is unaffected by chromosome type lack the supportive scientific backing found in the Ericsson Method's framework that highlights the differences in motility between sperm types.