Diploids Quiz
Questions: 16 · 10 minutes
1. A diploid cell passes through S phase and replicates its DNA but has not yet divided. What has changed?
It has become haploid because homologous chromosomes separated.
It has become tetraploid because every chromosome was copied.
Its DNA content has doubled, but its chromosome-set number remains diploid.
Its chromosome number has been cut in half, while its DNA content remains constant.
2. In the alternation of generations found in plants, which generation is normally diploid?
The sporophyte, which develops from the zygote
The gametophyte, which produces gametes by meiosis
The gamete generation, which begins before fertilization
The spore, which contains two homologous chromosome sets
3. Why are normal human sperm and egg cells described as haploid rather than diploid?
They contain chromosomes without any DNA.
They contain one complete chromosome set rather than two.
Their chromosomes cannot replicate.
They carry only sex chromosomes.
4. A diploid cell with 2n = 20 completes meiosis I normally. Which description best fits each resulting cell?
It has 20 unduplicated chromosomes and remains diploid.
It has 10 duplicated chromosomes and is haploid.
It has 10 unduplicated chromosomes and is diploid.
It has 20 duplicated chromosomes and is tetraploid.
5. In a standard meiosis model, one diploid precursor cell completes both meiotic divisions. What is the usual outcome?
Two diploid cells with unreplicated chromosomes
Two haploid cells with duplicated chromosomes
Four haploid cells produced through two successive divisions
Four diploid cells, each genetically identical to the precursor
6. A species has a diploid number of 2n = 18. Assuming normal meiosis, how many chromosomes will each gamete contain?
9
18
27
36
7. A cell has two copies of most chromosome types but three copies of one particular chromosome. How is this best described?
Haploid, because one chromosome type is unpaired
Tetraploid, because an extra chromosome set is present
Euploid, because every chromosome type is represented
Aneuploid, because the number of one chromosome differs from the usual complement
8. In a typical diploid organism, what makes two chromosomes a homologous pair?
They are identical sister chromatids joined at one centromere.
They are any two chromosomes of similar physical length.
They carry exactly the same alleles and must have identical DNA sequences.
They carry corresponding genes, with one chromosome usually inherited from each parent.
9. Which sample from a typical flowering plant is most likely composed of diploid cells?
A cell from a mature leaf
An egg cell within the embryo sac
A pollen grain
A sperm cell carried by a pollen tube
10. Which statement correctly compares haploid and diploid cells of the same species?
Diploid cells have two chromosome sets, while haploid cells have one.
Diploid cells always have twice as much DNA as any haploid cell, regardless of replication stage.
Haploid cells contain genes, while diploid cells contain only chromosomes.
Haploid cells divide only by meiosis, while diploid cells divide only by mitosis.
11. In standard genetics notation, what does 2n represent?
The amount of DNA present after chromosome replication
A diploid chromosome complement
Two identical sister chromatids
The number of chromosomes in a gamete
12. A species has 12 homologous chromosome pairs in each body cell. What is its diploid chromosome number?
6
12
24
48
13. What does it mean for a cell to be diploid?
It contains only one chromosome from each homologous pair.
Every chromosome has duplicated into two sister chromatids.
It contains two complete sets of chromosomes.
Its chromosomes are arranged in one continuous DNA molecule.
14. In a species, both the egg and sperm contain 8 chromosomes. What chromosome number should the fertilized zygote have?
8, because fertilization preserves the haploid number
16, because fertilization combines two haploid sets
32, because both gametes replicate immediately
64, because each chromosome consists of multiple DNA strands
15. A diploid body cell divides by mitosis without mutation or chromosome-separation errors. What is expected of each daughter cell?
It is haploid with half the parent's chromosome number.
It contains only the chromosomes inherited from one of the organism's parents.
It is tetraploid because the parent's DNA was replicated.
It is diploid with the same chromosome number as the parent cell.
16. How many chromosomes are normally present in a typical human somatic cell?
22
23
92
46