After fertilization, the resulting zygote begins to divide by __________.
In some organisms such as certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would be the consequence of this?
Which of the following statements regarding sexual and asexual reproduction is true?
Sexual reproduction is more likely to increase genetic variation than is asexual reproduction.
homologous chromosomes stick together in pairs.
prophase I, metaphase I, anaphase I, telophase I, cytokinesis, meiosis II.
Meiosis I produces _____ cells, each of which is _____.
Meiosis II typically produces _____ cells, each of which is _____.
During _____ sister chromatids separate.
At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids.
Homologous chromosomes migrate to opposite poles during _____.
During _____ chromosomes align single file along the equator of a haploid cell.
At the end of _____ and cytokinesis there are four haploid cells.
During _____ a spindle forms in a haploid cell.
A human bone marrow cell in the prophase stage of mitosis contains 46 chromosomes. Therefore, there are a total of __________ sister chromatids in this cell.
The function of meiosis is to make __________.
In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing _____ chromosomes.
During which stage of meiosis do synapsis and crossing over occur?
At the end of telophase I of meiosis, as cytokinesis occurs, there are __________.
At the conclusion of meiosis I, the daughter cells are _____.
What is the typical result when a diploid cell undergoes meiosis?
Meiosis differs from mitosis in that _____ only occurs in meiosis.
Which of the following statements regarding the differences between mitosis and meiosis is false?
Crossing over is a phenomenon that creates genetic diversity during mitosis.
a similar but not identical combination of genes.
Down syndrome can be the result of _____.
Trisomy for the other autosomal chromosomes is often lethal, and the affected embryos are miscarried.
Only one copy of the X chromosome is functional, regardless of the total number of X chromosomes.
A normal watermelon has 22 chromosomes but seedless watermelons have 33 chromosomes.
Which of the following types of organisms commonly demonstrates polyploidy?
How many generations does it take to develop a new plant species by polyploidy?