Exam 7: Cell Division

The attachment of microtubules to the centromeres of chromosomes sets the stage for the positioning of the chromosomes at the metaphase plate;the attachment of the microtubules occurs during the mitotic phase called ________.

Compared with the amount of genetic material in a generalized body cell,gametes contain

Which of the following statements about the chromosomes in a homologous pair is true?

Some daughter cells are called clones;for this description to be accurate,the daughter cells must

At the end of telophase,the cell is ready for physical division into two cells;this process is called ________.

During prophase,the opposite ends,or spindle poles,of a cell that is beginning mitosis are determined by the separation of the ________.

During independent assortment,the paternal and maternal chromosomes of each homologous pair separate into different daughter cells.

The four cells that result from meiosis are not diploid like the cells produced by mitosis;instead,they are ________.

A process essential to cell division because it separates the two copies of DNA that are attached by the centromere is called DNA ________.

The sequence of events in meiosis II is prophase II,________,anaphase II,and telophase II,which is accompanied by cytokinesis.

If a plant has a karyotype of 18 chromosomes,how many chromosomes would each of its gametes have?

Parthenogenesis is a type of asexual reproduction in which embryos can be established and grow without fertilization.Essentially,this means that an embryo develops from an unfertilized egg.What is the most likely reason why the parthenogenetic whiptail lizards of the desert Southwest create no new genetic combinations during crossing-over,whereas other animals do?

DNA molecules are exceptionally long (about 6 feet in humans)and exceptionally thin.To minimize breakage and yet facilitate transcription,DNA forms into a complex known as chromatin by wrapping around ________.

You are examining the rapidly dividing cells of an onion root tip and you see a cell whose chromosomes are visible and arranged in approximately the same shape and size as the nucleus.What stage of mitosis is this cell in?

At the completion of mitosis,the nucleus of a human somatic cell has ________ chromosomes.

By the time a cell enters meiosis II,it has

The spindle microtubules break down and new nuclear envelopes form during the mitotic stage called ________.

Plant cells perform cytokinesis differently than animal cells because

The old saying that everyone has a double is likely to be true;except for genetic mutations,the number of meiotically possible recombinations of human DNA is much smaller than the total number of people in the world.

The events in meiosis I are almost identical to the events in mitosis.