Download Ch 9.3 SR

Sci 7 Ch 9.3 Section Review
1. True or false: A single gene determines the sex (male or female) of a human.
2. What is incomplete dominance? ___________________________________________
_________________________________________________________________
Give one example ________________________________________________________
3. How is codominance different than incomplete dominance? _____________________
_________________________________________________________________
Give one example of codominance.__________________________________________
4. The square to the right shows a cross between a tabby cat and a tan cat.
What is the probability of offspring with black fur? _______________
BT
BT
Tabby fur? _____________
Tan fur? _______________
5. Blood type is determined by three alleles, A, B, and O. Use the punnett
square below to answer questions a through c.
AB
BO
AO
OO
TT
TT
a. What is the probability of an offspring with type A blood? ________
b. What is the probability of an offspring with type O blood? ________
c. What are the genotypes and phenotypes of the parents? ________
6. Use the following terms to complete each sentence:
genes
codominance
incomplete dominance
traits
allele
a. __________ are segments of DNA that carry hereditary instructions and are found on
chromosomes.
b. Different forms of a single gene are called __________.
c. __________ is when a recessive and a dominant trait mix or blend.
d. In horses, when a pure red horse and a pure white horse mate to have offspring, the
offspring’s fur color is a mixture between red and white. This is an example of
__________.
e. Hair color, eye color, seed shape and plant height are examples of __________.
7. Put the following notes under the correct heading in the table.
Phenotype
Genotype
Recessive
Dominant
a. stronger allele that may mask a weaker allele
b. physical appearance of genetically inherited feature
c. a trait that will appear in the offspring if one of the parents has it
d. a weaker allele
e. a trait that must be contributed by both parents in order for it to appear in the offspring
f. PP, Pp, or pp
g. purple flowers, white flowers, black rabbits
h. genetic make up, the combination of alleles
i. the appearance due to the combination of alleles present