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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