Meiosis
80a.
Do chromosomes replicate or double before meiosis?
81a. How many divisions occur in meiosis? Is this the same as mitosis? Explain.
82a. Meiosis is also called _____________________________________.
83. The original cell that divides by meiosis is ________________ or 2n.
84. How many daughter cells can be produced by meiosis? Is this the same as mitosis?
Explain.
85. What is the chromosome number of the daughter cells produced by meiosis? How does
this compare to the number of chromosomes in the original cell?
86. What are the daughter cells called that are produced by meiosis? Name them.
87. Name the 2 types of meiosis.
a.
b.
88. Where does spermatogenesis occur?
89. Where does oogenesis occur?
90. In humans, how many chromosomes are in the original that undergoes meiosis? Are they
single or double stranded?
91. After one division, how many chromosomes are in the cells? Are they single or double
stranded?
92. After the second division, how many chromosomes are in the cells? Are they double or
single stranded?
93. Is meiosis sexual or asexual reproduction?
94. Are eggs & sperm haploid or diploid?
95. What process joins the egg & sperm to restore the original chromosome number of the
organism?
96. When a sperm fertilizes an egg, a new 2n cell forms called the
_____________________.
97. ________________ are pairs of sister chromatids that have the same genes, but may
have different alleles.
98. _____________ reduces the chromosome number by half, while ____________
restores it.
99. In Meiosis I, what separates?
100. In Meiosis II, what separates?
101. Name these stages of Meiosis I.
102. Name 2 things that occur in Early Prophase I.
103. Name 3 things that happen in Late prophase I.
104. What is a tetrad? Label the centromere and put a box around a sister chromatid.
105. ____________ is the process in prophase I that forms tetrads.
106. Once tetrads form, what happens to the homologous chromosomes? What is this
called?
107. Crossing-over results in genetic ________________ in the offspring.
108. What happens during Metaphase I?
109. Name 2 things that occur in Anaphase I?
110. Name 3 things that occur in Telophase I?
111. At the beginning of Meiosis II, each cell has how many homologs of each
chromosome?
112. Sister chromatids carry ____________ genetic information (same genes & same
alleles).
113. The gametes at the end of Meiosis II will have how many copies of a gene for a trait?
114. Name the stages in Meiosis II.
115. What happens in Prophase II?
116. Where are the sister chromatids in Metaphase II?
117. What happens to the sister chromatids during Anaphase II?
118. Name 4 things that occur in Telophase II?
119. Meiosis results in __________ haploid cells called _________ that have _______
copy of each chromosome and _________ allele for each gene in different
___________________.
Gametogenesis
120. Gametogenesis that produces sperm cells is called
______________________________.
121. Where does spermatogenesis occur?
122. Immature sperm cells are called ___________________.
123. How do mature sperm cells move?
124. Approximately how many sperm do men produce each day?
125. Label the diagram of spermatogenesis.
126. Where does oogenesis occur?
127. Name the 4 cells produced by oogenesis.
128. What happens to the polar bodies & WHY?
129. ________________ are immature eggs.
130. How often do females produce an oocyte & starting at what age?
131. Label the diagram of oogenesis.
Comparing Mitosis & Meiosis
132. Complete the following table comparing mitosis & meiosis.
Mitosis
Number of divisions
Number of
Daughter cells
Genetically
Identical
Chromosome
Number
Where Occurs
When occurs
Role
Meiosis