Answer: Option [A]Chromosome number is Fixed for a species. Chromosome number in any species is constant. Chromosome is the carrier which carries DNA, the genetic material. Human beings have 23 pairs of chromosomes, which is constant in all human beings.
Answer: Option [B]The twenty thirds chromosomes in man is known as Heterosome. Twenty third pair of human chromosomes is called sex chromosomes (XY in males and XX in females). These chromosomes of dissimilar appearance that determine sex in some diploid organisms are known as Heterosomes.
Answer: Option [A]The carriers of hereditary material are Chromosomes. Chromosomes and genes are the carriers of hereditary material. Chromosomes are the thread-like structures that are located inside the nucleus and made up of a single molecule of deoxyribose nucleic acid and protein.
Answer: Option [C]In man the normal number of chromosomes is 46. In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females.
Answer: Option [D]The genetic material of virus is DNA or RNA. All viruses have genetic material (a genome) made of nucleic acid. You, like all other cell-based life, use DNA as your genetic material. Viruses, on the other hand, may use either RNA or DNA, both of which are types of nucleic acid.