A Certain Kind of Snail Can Have a Right-Handed Direction

question 41

Multiple Choice

A certain kind of snail can have a right-handed direction of shell coiling (DD or Dd) or left-handed coiling (dd) . However, if direction of coiling is due to a protein deposited by the mother in the egg cytoplasm, then a Dd egg-producing snail and a dd sperm-producing snail will have offspring of which genotype(s) and phenotype(s) ?

• A) 1/2 Dd:1/2 dd; all right-coiling
• B) all Dd; all right-coiling
• C) 1/2 Dd: 1/2 dd; half right-coiling and half left-coiling
• D) all Dd; half right-coiling and half left-coiling

Demonstrate knowledge of measures to break the chain of infection at various levels.

Recognize the importance of hand hygiene in preventing the transmission of infections.

Understand the principles behind the absence of pathogenic microorganisms.

Comprehend the elements necessary for an infection to occur and spread.