SCIENCE TEST
TENTH GRADE
NAME:
DATE:
1. Explain the following statement:
Bacteria can produce human proteins.
2. Which best describes a plasmid:
a. A large piece of extrachromosomal prokaryotic DNA
b. A small round piece of bacterial DNA
c. A small ring of DNA in the cytoplasm of a bacterium.
3. Solve the following genetic problems:
1. Genetics - X Linked Genes
In fruit flies, eye color is a sex linked trait. Red is dominant to
white.
1. What are the sexes and eye colors of flies with the following
genotypes?
X R X r _________ X R Y __________ X r X r __________
X R X R ____________ X r Y ____________
2. What are the genotypes of these flies:
white eyed, male ____________ red eyed female (heterozygous)
________
white eyed, female ___________ red eyed, male ___________
2. Show the cross of a white eyed female X r X r with a red-eyed male X
R
Y.
3. Show a cross between a pure red eyed female and a white eyed male.
What are the genotypes of the parents:
___________ and _______________
How many are:
white eyed, male ____
white eyed, female ____
red eyed, male ____
red eyed, female ____
2 PART. Multiple Allele Traits
Blood type is controlled by 3 alleles: A, B, O. A & B are codominant, O is
recessive.
1. a) What are the two genotypes possible for a person who as A blood?
______________
b) What genotype does a person with AB blood have? _______________
c ) What genotype does a person with O blood have? _____________
d) What are the two genotypes possible for a person who as B blood?
______________
2.A man with type AB blood is married to a woman also with type AB blood.
What percentage of their children will have:
A blood? _______ B blood? ______ O blood _____ AB blood ________
4. A man with type AB blood is married to a woman with type O blood.
They have two natural children and one adopted child. Jane has
type A blood, Bobby has type B blood, and Grace has type O
blood. Which child was adopted?
5. PEDIGREE
In humans, albinism is a recessive trait. The disorder causes a lack of
pigment in the skin and hair, making an albino appear very pale with white
hair and pale blue eyes. This disorder also occurs in animals, a common
albino found in a laboratory is the white rat. The pedigrees below trace the
inheritence of the allele that causes albinism
KEY: Square: male; Circle: female ; colored square, circle: affected
individual.
1. Given the following genotypes, describe the phenotypes (normal or albino)
AA = ________________________________
Aa = ________________________________
aa = ________________________________
2. Fill out the blanks on the pedigree below.
3. How many children does this family have? _______
What are the sexes of the children? ________