Problem 1
The main evolutionary advantage of sexual over asexual reproduction is that it produces a. more offspring per individual b. more variation among offspring c. healthier offspring
Problem 2
Meiosis is a necessary part of sexual reproduction because it a. divides two nuclei into four new nuclei b. reduces the chromosome number for gametes c. produces clones that can cross over
Problem 3
Meiosis a. occurs in all eukaryotes b. supports growth and tissue repair in multicelled species c. gives rise to genetic diversity among offspring d. is part of the life cycle of all cells
Problem 4
Sexual reproduction in animals requires a. meiosis c. germ cells b. fertilization d. all of the above
Problem 5
Meiosis_____the parental chromosome number. a. doubles c. maintains b. halves d. mixes up
Problem 6
Dogs have a diploid chromosome number of 78 . How many chromosomes do their gametes have? a. 39 c. 156 b. 78 d. 234
Problem 9
Crossing over mixes up a. chromosomes c. zygotes b. alleles d. gametes
Problem 10
Crossing over happens during which phase of meiosis? a. prophase I c. anaphase I b. prophase II d. anaphase II
Problem 11
________ contributes to variation in traits among the offspring of sexual reproducers. a. Crossing over c. Fertilization b. Random attachment d. both a and \(b\) \(\begin{array}{ll}\text { of chromosomes } & \text { e. all are factors }\end{array}\) to spindle poles
Problem 12
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 pair up only in meiosis. c. DNA is replicated only in mitosis. d. Sister chromatids separate only in meiosis. e. Interphase occurs only in mitosis.
