Question
Question: How many sets are represented in the species with 156 chromosomes? A. 12 B. 78 C. 39 D. 19...
How many sets are represented in the species with 156 chromosomes?
A. 12
B. 78
C. 39
D. 19
Solution
Chromosomes appear to be thread-like structures present inside the nucleus of animal and plant cells. Since we know that chromosomes are made up of chromatids and chromosomes are present as sets whenever we discuss it about different species.
Complete answer:
Each chromosome is a form of protein as well as a single molecule of deoxyribonucleic acid (DNA). It is passed from parents to their offspring, DNA contains very specific instructions that makes each type of living creature a unique one. Since we know that each set or one set has a total 2 numbers of chromosomes. In question we are given 156 chromosomes so we divided it by 2 , so we get 78.
Hence, the correct answer is option (B).
Additional information:
In humans, each cell of our body normally contains 23 pairs of chromosomes i.e for a total of 46. Out of these twenty-two pairs, are known as autosomes, which look similar in both males and females. The 23rd pair, is known as the sex chromosomes, which differ between males and females. Females have two copies of the X chromosome i.e. XX, while males have one X and one Y chromosome in them.
-Telocentric: These are rod-like chromosomes with centromere present on the proximal end. No ‘p’ arm (short arm) present. Telomeric chromosomes are generally not found in humans
-Acrocentric: These are also rod-like, centromere is present at the one end giving rise to one very short arm and other an exceptionally long arm
-Submetacentric: They appear L-shaped or J-shaped, with their centromere near the centre of the chromosome giving rise to two unequal arms
-Metacentric: These are V-shaped chromosomes with centromere present in the middle giving rise to two equal arms
Note: Chromosomes in other words can be said that they are present in sets since the one of the two is obtained from one parent and the other parent. If a cell contains paired chromosomes it is said to be diploid and if it contains single then it is said to be haploid.