Which is the smallest unit containing the entire human genome?
at most, 2 alleles for that gene
If an organism is diploid and a certain gene found in the organism has 18 known alleles (variants), then any
given organism of that species can/must have which of the following
In alternation of generations, what is the diploid stage of a plant that follows fertilization called?
Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.
How are sister chromatids and homologous chromosomes different from each other?
63 chromosomes in 21 sets of 3
A triploid cell contains three sets of chromosomes. If a cell of a usually diploid species with 42 chromosomes per cell is triploid, this cell would be expected to have which of the following?
44 autosomes and 2 sex chromosomes
63 chromosomes in 21 sets of 3
length, centromere position, staining pattern, and traits coded for by their genes
In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of these pairs, such as pair 14, which of the following do the two chromosomes of the pair have in common?
II, III, and IV
Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all sexual life cycles have in common?
I. Alternation of generations
A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte).
Which of the following is an example of alternation of generations?
DNA staining and a light microscope
To view and analyze human chromosomes in a dividing cell, which of the following is (are) required?
Referring to a plant’s sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?
Each cell has eight homologous pairs.
Which of the following is true of a species that has a chromosome number of 2n = 16?
At sexual maturity, ovaries and testes produce diploid gametes by meiosis.
Which of these statements is false?
a haploid animal cell.
Mitosis is commonly found in all of the following except
a plantlike protist
Which of the following can utilize both mitosis and meiosis in the correct circumstances?
either anaphase I or II
The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following?
cohesins are protected from cleavage at the centromere during meiosis I.
Experiments with cohesins have found that
an error in either egg or sperm meiotic anaphase
Which of the following might result in a human zygote with 45 chromosomes?
haploid, and the chromosomes are each composed of two chromatids
After telophase I of meiosis, the chromosomal makeup of each daughter cell is
late prophase of meiosis I
When does the synaptonemal complex disappear?
two sister chromatids that have synapsed
A pair of homologous chromosomes includes which of the following sets of DNA strands?
The statement is true for meiosis I only.
Independent assortment of chromosomes occurs.
Specific proteins break the two strands of nonsister chromatids and re-join them.
When homologous chromosomes cross over, what occurs?
Barring mutation, the two sister chromatids must be identical.
Two sister chromatids are joined at the centromere prior to meiosis. Which statement is correct?