Ch 12 & 13 HW

The statement, "It is a matter of chance which homolog goes to which daughter cell" best describes _____.

Which processes lead to most genetic variation in sexually reproducing organisms?

Which of these gametes contains one or more recombinant chromosomes?

Normal human gametes carry _____ chromosomes.

A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes.

DNA replication produces two identical DNA molecules, called _______________, which separate during mitosis.

After chromosomes condense, the ___________ is the region where the identical DNA molecules are most tightly attached to each other.

During mitosis, microtubules attach to chromosomes at the ______________.

In dividing cells, most of the cell's growth occurs during _________.

The _____________ is a cell structure consisting of microtubules, which forms during early mitosis and plays a role in cell division.

In most eukaryotes, division of the nucleus is followed by ____________, when the rest of the cell divides.

The ______________ are the organizing centers for microtubules involved in separating chromosomes during mitosis.

How would genetic variation be affected if, during meiosis I, maternal chromosomes always lined up together on one side of the metaphase plate and paternal chromosomes always lined up on the other side (ignoring the effects of crossing over)?

Mitosis

Prophase

Prometaphase

Metaphase

Anaphase

Telophase

What is the ploidy of this cell model? (Figure #1)

What is the ploidy of this cell model?

This cell is diploid.

The bands on the chromosomes represent certain genes.

There are five different lengths of chromosomes in this cell.

This cell is 2n = 10.

Each chromosome contains one long molecule of double-stranded DNA and proteins.

The chromosomes are replicated.

Suppose a diploid cell with three pairs of homologous chromosomes (2n = 6) enters meiosis. How many chromosomes will the resulting gametes have in each of the following cases? 1. meiosis occurs normally 2. nondisjunction of 1 chromosome pair in meiosis I 3. nondisjunction of all 3 chromosome pairs in meiosis I 4. nondisjunction on 1 chromosome in 1 daughter cell in meiosis II 5. nondisjunction of all 3 chromosomes in 1 daughter cell in meiosis II

During what phase of the cell cycle does the DNA become replicated?

Which event does not take place before the start of mitosis?

True or false? Mitosis takes place during M phase, which is the longest phase of the cell cycle.

Which term describes two recently replicated DNA strands that are joined together just before cell division?

During which stage of mitosis are chromosomes lined up in the center of the cell?

Which stage of mitosis is characterized by the disintegration of mitotic spindles and the formation of two new nuclear membranes?

To which part of the centromere do mitotic spindle fibers attach during prometaphase?

During which substage of mitosis do sister chromatids break apart and start moving to opposite poles of the cell?

Two important checkpoints that regulate the cell's progression through the cell cycle occur in the _____ and _____ phases of the cell cycle.

What proportion (percent) of chromosomes in a human skin cell are paternal chromosomes?

Which answer correctly identifies a cell-cycle checkpoint with a criterion for passing it?

For the male Drosophila shown in Figure 13.1, what are the (1) haploid number, (2) ploidy, and (3) total number of chromosomes?

What would be the outcome of meiosis I if none of the homologous chromosomes separate at anaphase?

Meiosis typically produces _____ cells, each of which is _____.

This image depicts a view of _____ during meiosis.

During _____ sister chromatids separate.

Mitosis is responsible for what key process in multicellular eukaryotes?

What is the ploidy of organisms that have two sets of chromosomes?

What information can not be obtained from an individual's karyotype?

True or false? A haploid organism has one pair of homologous chromosomes.

If a cell has 24 chromosomes, how many chromosomes would each of its four daughter cells have after meiosis?

Which of the following statements about meiosis and mitosis is true?

Which structure is directly correlated with the production of genetic variability in the daughter cells produced during meiosis?

For the experiment shown in Figure 12.6, which answer best describes what the prediction would be if chromosome movement were based on microtubule shortening at the spindle pole?

A diploid species has ten distinct types of chromosomes. A haploid cell of this species contains how many chromosomes?

The karyotype of a trisomic individual is symbolized as ____.

Which answer correctly associates a phase of mitosis with what happens to chromosomes during that phase?

In which mitotic phase do the chromosomes condense and does the mitotic spindle begin to form?

The division of the cytoplasm following mitosis is called _____.