HUMAN HEREDITY PRINCIPLES AND ISSUES UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS COMPLETE STUDY GUIDE FULL SOLUTION

HUMAN HEREDITY PRINCIPLES AND
ISSUES UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS COMPLETE STUDY
GUIDE FULL SOLUTION

●● Coding sequences (1.2%)
Answer: Encode proteins; highly conserved across species.


●● Noncoding sequences (3-4%)
Answer: Regulatory roles; include RNA genes.


●● Repetitive elements
Answer: Satellite DNA, transposons, gene duplications.


●● Heterochromatin
Answer: Condensed, inactive regions (centromeres, telomeres).


●● Coding vs. Noncoding
Answer: Coding sequences make proteins; noncoding sequences
regulate or produce functional RNAs.


●● RNA genes

, Answer: Encode functional RNAs (not proteins); more numerous than
protein-coding genes.


●● Satellite DNA
Answer: Highly repetitive tandem sequences; variable among
individuals → basis of DNA fingerprinting/profiling.


●● Transposons
Answer: Mobile elements


●● Cut-and-paste transposition
Answer: excision and reinsertion.


●● Copy-and-paste retrotransposition
Answer: RNA intermediate, reverse transcribed, inserted elsewhere →
increases copy number.


●● why is only ~5% of the Human Genome coding/noncoding
sequences that are highly conserved?
Answer: Genome composition reflects that only about 5% of the human
genome is coding or highly conserved noncoding sequences. The
remainder consists of repetitive DNA, transposons, pseudogenes, and
other elements accumulated over evolutionary time through duplication,
transposition, and other mechanisms.