Science Homework
Due: Friday, October 21
Name: ______________________________
th
, 2011
Teacher: ____________
Period: ____
TEST REVIEW:
Word Bank:
DNA
GENES
NUCLEUS
CHROMOSOME
HOMOGYGOUS
HETEROZYGOUS
PHENOTYPE
GENOTYPE
ASEXUAL REPRODUCTION
SEXUAL REPRODUCTION
DOMINANT ALLELE
OFFSPRING
ALLELE
RECESSIVE ALLELE
DIVERSITY
DIRECTIONS: Use the word bank and your notes to complete each sentence below.
1. ___________________ is the mating of two organisms to produce offspring. This produces the most
diversity in offspring.
2. An ________________ is a form of a gene that you inherit from each parent. It can be recessive or
dominant.
3. When a person receives identical alleles from each parent (ex: EE or ee) the person is ______________
for that trait.
4. When a person receives a different allele from each parent (ex: Ee) the person is __________________
for that trait.
5. ___________________ is a word that is used to describe the different traits of a population.
6. The exact alleles that are inherited by each parent are considered a person’s _________________.
Another way to say this would be that it is a person’s genetic code for a trait.
7. A _____________________ is the outward expression of a trait or characteristic. It is the appearance
of the trait.
8. A _____________________ always masks (or covers up) the effect of the recessive allele. When
writing a genotype it is usually written with a capital letter.
9. __________________ are would up strands of DNA that are located in the nucleus of each cell.
Humans have 23 pairs.
10. ___________________ are a location on a chromosome that consisting of base pairs that code for
specific traits.
11. DNA (in the form of chromosomes) is located in the ______________ of each cell.
12. __________________ is another word for baby or children.
13. A _____________________ is always masked (or covered up) by a dominant allele. In order for a
recessive allele to show up, both alleles inherited from the parent must be recessive.
14. _______________________ is a form of reproduction only requiring one organism. The organism
makes an exact copy (replica) of itself.
15. The genetic material that chromosomes are made from is called ________________. It contains four
base pairs that code for the traits of an organism.
Directions: Using your notebook and what you learned from the DNA poster project please complete the
following drawings.
DRAW DNA in the form of chromosomes in the
nucleus of a cell. LABEL the cell, nucleus,
chromosomes
DRAW an example of genes located on a
chromosome. Show a close up view of what the
gene would look like. LABEL chromosome, gene
Directions: Look at the human traits below in the chart. Use the chart to complete the table of information
about Susan and Bob’s offspring (children).
1. Bob and Susan are both HETEROZYGOUS for earlobes (Ff). What are the possible genotypes of their
offspring? What are the possible phenotypes?
2. Bob is HOMOZYGOUS DOMINANT for a the shape of his finger and Susan is HOMOZYGOUS RECESSIVE
for a bent finger. What are the possible genotypes and phenotypes their offspring can have?
SEXUAL and ASEXUAL reproduction:
1. If Susan reproduced asexually what would be the outcome if she had offspring? What would they look
like?
2. Does sexual or asexual reproduction produces MORE diversity in offspring? EXPLAIN.