Name________________________________________ Date______________ Period _________________
Meiosis HW #1
Directions: Use the terms in the word bank to complete the paragraph below. Some words will not be
used.
Diploid
Meiosis
Gamete
Haploid
Homologous chromosomes
Gene
Fertilization
Crossing over
A segment of DNA on a chromosome that controls the production of a protein is called a
_____________. A ________________ cell contains two copies of each chromosome. A sex cell, or
______________________, is ________________________ meaning it contains one copy of each
chromosome. ______________________________ are pairs of chromosomes, one from each parent.
_____________________________ creates genetic variation by providing new combinations of
genes that are different from the parents.
Directions: Compare meiosis and mitosis by filling in the chart below with the correct answer
Mitosis
Meiosis
Number of times cell is in interphase
Number of DNA replications
Number of cell divisions
Number of daughter cells
Chromosome number of daughter cells (n or 2n)
Directions: Use the word bank to correctly complete each sentence. Some words may be used more
than once.
Diploid
Haploid
Meiosis
Mitosis
Homologous chromosomes
1. In meiosis, one ______________________ cell divides to make four ________________ cells.
2. A ______________________ cell has half the chromosomes of a ____________________ cell.
3. Pairs of chromosomes that have genes for the same trait arranged in the same order are
_______________________________________.
4. During __________________________, two divisions of the nucleus and the cytoplasm occur.
5. Prophase I and prophase II are stages in ______________________.
6. In ____________________ two identical somatic cells are made.
7. In ____________________ four different gametes are made.
Directions: Complete the table below and answer the questions that follow
Organism
Somatic Cells
(2n)
Gametes
(n)
Human
46
23
Garden Pea
14
Fruit Fly
16
Tomato
12
Chimpanzee
78
Dog
48
Leopard Frog
Corn
1.
2.
3.
4.
39
13
20
What is the diploid number for a chimpanzee? ____________
What is the haploid number for a fruit fly? _______________
Which organism has 24 chromosomes in each of it’s body cells? ____________________
Which organism contains 24 chromosomes in each of it’s egg cells? _________________
Directions: Answer each question on the lines provided.
1. If a male organism has 40 chromosomes in each body cell, how many chromosomes does a
female of the same species have in each body cell? _____________
2. How many homologous pairs of chromosomes does the male have? _____________
3. How many chromosomes would be in a sperm cell and in an egg cell? ____________
4. How many chromosomes would be in an offspring? ____________
5. How many pairs of homologous chromosomes would be in an offspring? _____________
Directions: Complete the table by checking the correct column(s) for each description
Mitosis
Involves in the production of gametes
Involves in growth and repair
Promotes genetic variation in organisms
Consists of one nuclear division (nucleus divides once)
Produces daughter cells that are genetically identical
Involves two sets of nuclear division (nucleus divides twice)
Produces daughter cells that are not identical
Occurs during sexual reproduction
Occurs during asexual reproduction
Results in four haploid gametes
Meiosis