एक प्रयोग में, मक्खियों की दो आबादियों को कई पीढ़ियों तक अलग-अलग रखा जाता है। आबादी A में निकट से संबंधित जीव (अंतःप्रजनन) हैं, जबकि आबादी B में असंबंधित जीवों का एक समूह है। कई पीढ़ियों के बाद, यह देखा गया कि आबादी A के जीवों की अनुकूलता (fitness) आबादी B के जीवों की तुलना में कम है, क्योंकि:

Which of the following statements are correct with reference to packaging of DNA helix? A. Histones are organized to form a unit of eight molecules called histone octamer. B. Histones are negatively charged basic proteins. C. Histones are rich in the basic amino acid residues - lysine and arginine. D. The positively charged DNA is wrapped around the histone octamer to form nucleosome. E. The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins. Choose the correct answer from the options given below:

Which of the following statements are true with reference to sex-determination in honeybees? A. An offspring formed from the union of a sperm and an egg develops as a female (queen or worker). B. An unfertilized egg develops as a male by parthenogenesis. C. A male has half the number of chromosomes than that of a female. D. Males produce sperms by meiosis. E. Honeybees have a haplodiploid sex-determination system. Choose the correct answer from the options given below: