Mutations in the Third Position of Codons Are the Least

question 180

Multiple Choice

Mutations in the third position of codons are the least likely to affect the amino acid sequence.Mutations in the second position are most likely to change the amino acid sequence, whereas first-position mutations are intermediate.Based on what you know about molecular evolution, predict the relative rates of evolution for first-, second-, and third-position codon nucleotides, from least likely to most likely.

• A) First, second, third
• B) First, third, second
• C) Second, first, third
• D) Third, second, first
• E) Third, first, second

---

Definitions:

Male Condoms

A barrier form of contraception worn over the penis during sexual activity to prevent pregnancy and reduce the risk of sexually transmitted infections.

Symptothermal

A method of natural family planning that combines the observation of symptoms and body temperature to track fertility.

Basal Body Temperature

The lowest body temperature attained during rest, often used to monitor ovulation and fertility.

Cervical Mucus

The fluid produced by the cervix, which changes in consistency and volume throughout the menstrual cycle, playing a role in fertility.