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Bio CP- Mr.Willets
Homework- Cell Division & Reproduction
1) Cells divide for what three reasons? ______________________________________________
2) Unicellular organisms divide only for ____________________________
3) The two types of cell division are _____________________ and ___________________
4) Mitosis is used for ____________________ reproduction, growth and repair
5) Sexual reproduction requires which type of cell division? ___________________
6) As a result of mitosis, the two new cells have how much DNA (chromosomes)? ___________________
7) As a result of meiosis, the two new cells have how much DNA? ______________________________
8) Before mitosis can occur, the DNA must ___________________________ to produce two sets of chromosomes.
9) During prophase, the _______________________ thicken and become visible as ______________
What forms during prophase? ____________________ What disappears during prophase? ___________________________
10) During which phase do the chromosomes line up along the equator? ______________________
11) During which phase do the two sets of chromosomes separate? ______________________
12) Before separating, each chromosome was made of two identical ___________________ attached by a
___________________________
13) What pulls the two sets of chromosomes apart? _______________________
14) All the things that happened during prophase are reversed during which phase? _________________
15) The division of the cytoplasm is called _______________________. In plants, this happens when a ____________________ forms in the middle and grows to the edges. In animals, the sides of the cell
_______________________ to divide the cytoplasm.
16) Asexual reproduction does not involve a joining of _______________. In asexual reproduction, the DNA of the offspring is the_______________________ as the parent. The type of cell division that is used for asexual reproduction is ___________________. Off spring produced asexually can be called ____________________
17) Give some examples of asexual reproduction __________________________________________
18) Sexual reproduction involves the joining of two special cells called ___________________. The joining process is called _____________________. The cell formed by this joining is called the ______________________. If the sperm and the egg meet inside the female. it is called _____________________ fertilization (this is also called ____________ fertilization) If the sperm and the egg meet outside the organism (usually in _____________) it is called ____________________
fertilization. "Test tube babies" are produced by __________________ fertilization. This phrase means "in ______________"
19) The male gamete is called ____________________ The female gamete is called the____________ or ovum. Compared to the egg, the sperm is ________________ and able to _________________.
20) If one organism can produce both sperm and egg, it is called _______________________________
21) Sperm cells are produced in what male body structure? ____________________ Egg cells are produced in what female body structure? ___________________
22) Chromosomes occur in pairs called ________________________ pairs. Humans have how many homologous pairs? _________________ How does the DNA of one member of a pair compare to the DNA of the other member of the pair? _____________________________________________________
23) The number of chromosomes found in a normal body cell is called the ________________ number. and is abbreviated _________. The number of chromosomes in a sex cell (gamete) is called the ____________________ number and is abbreviated ____________.
24) How many chromosomes do gametes have compared to normal body cells? ______________________
Gametes have _________member of each pair. Normal body cells have _____________ members of each pair.
25) What type of cell division produces gametes? ___________________
26) The process that occurs in the testes to produce sperm cells using meiosis is called
______________________________________ The process that produces egg cells using meiosis is called _____________________________________
27) ____________________________ is when an egg develops into an organisms without being fertilized. This means that this organism would have how many chromosomes? __________________________________ In other words, this organism would be ___________ (haploid or diploid)
28) The process that changes a zygote into an adult organism is called __________________________
29) _________________________ is when a zygote divides over and over again.
30) The hollow ball stage of development is called the ____________________________ When a pocket forms inside this hollow ball, it is called a _______________________
31) The three germ layers of cells in the gastrula are called the ________________ , the _______________ and the ________________.
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