Chapter 9

Mitosis and cytoplasmic division function in _________ a. asexual reproduction of single-celled prokaryotes b. development and tissue repair in multicelled species c. sexual reproduction in plants and animals

A cell with two of each type of chromosome has a chromosome number that is ________ a. diploid b. haploid c. tetraploid d. abnormal

Homologous chromosomes are _______ a. inherited from two parents b. sister chromatids c. different in size and length d. identical in DNA sequence

After DNA replication, how many chromatids does a chromosome have?

Interphase is the part of the cell cycle when ________ a. a cell ceases to function b. the spindle forms prior to nuclear division c. a cell grows and replicates its DNA

After mitosis, the chromosome number of a descendant cell is ______ the parent cell's. a. the same as b. one-half of c. rearranged compared to d. doubled compared to

One evolutionary advantage of sexual over asexual reproduction may be that it produces _______ a. more offspring per individual b. more variation among offspring c. less harmful mutations

Alternative forms of the same gene are ______ a. gametes b. homologous c. alleles d. oncogenes

Meiosis is a necessary part of sexual reproduction because it ______ a. divides one nucleus into four new nuclei b. reduces the chromosome number for gametes c. gives rise to new alleles

Crossing over mixes up parental ______ a. chromosomes b. alleles c. zygotes d. gametes

Sexual reproduction in animals requires _______ a. meiosis b. fertilization c. gametes d. all of the above

Which of the following is one of the very important differences between mitosis and meiosis? a. Chromosomes align midway between spindle poles only in meiosis. b. Homologous chromosomes separate only in meiosis. c. Sister chromatids separate only in meiosis.

Match each stage with the events listed. a. sister chromatids move apart prophase metaphase b. chromosomes pack tightly anaphase c. new nuclei form telophase d. DNA replication interphase e. chromosomes aligned midway between spindle poles

Match each stage of mitosis with the events listed. _____ prophase \(\quad\) a. sister chromatids move apart _____ metaphase \(\quad\) b. chromosomes start to condense _____ anaphase \(\quad\) c. new nuclei form _____ telophase\(\quad\) d. all chromosomes are aligned in the middle of the cell