Chromosome Structure and Numbers Worksheet
Grade 11 Biology worksheet covering chromosome structure, types, and numbers, including concepts like DNA, histones, chromatin, karyotypes, and ploidy.
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Chromosome Structure and Numbers
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. What is the primary function of histones in chromosome structure?
To replicate DNA
To package and condense DNA
To synthesize proteins
To transcribe RNA
2. A human somatic cell contains how many chromosomes?
23
46
92
Depends on the individual
3. The constricted region of a chromosome that holds sister chromatids together is called the .
4. A is an organized profile of a person's chromosomes, arranged in homologous pairs.
5. The process by which DNA is tightly coiled around proteins to form chromosomes is called .
6. Describe the difference between a chromatin and a chromatid.
7. Explain the significance of diploid (2n) and haploid (n) chromosome numbers in sexual reproduction.
8. Label the following parts of the chromosome diagram:
a.
b.
c.
d.
9. All human cells contain 46 chromosomes.
True
False
10. Sister chromatids are identical copies of a chromosome.
True
False