घोड़े के विकास के इतिहास में निम्नलिखित वंशों (genera) को कालानुक्रमिक क्रम में (सबसे पुराने से सबसे नए तक) व्यवस्थित कीजिए: (A) मायोहिप्पस (Miohippus) (B) ओरोहिप्पस (Orohippus) (C) हाइराकोथेरियम (Hyracotherium) (D) मेरीचिप्पस (Merychippus) नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:

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: