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Name: _____________________________
Pretest Score: _____/43
Post test score : _____/43
Ch 11 & 14.1 Pretest: Genetics
Match the definition on the left with the vocab word on the right.
1. _____ has two different alleles; another
word for heterozygous
2. _____ something that has more than one gene
controlling it
3. _____ different form of a gene
4. _____ genetic cross where two traits are
examined at once
5. _____ one allele does not completely suppress
the other, the phenotypes mix
6. _____ chromosomes line up randomly during
meiosis, thus genes are randomly
distributed
7. _____ one who has the gene for a trait, but
does not show it
8. _____ trait on the X or Y chromosome
9. _____ an allele that suppresses the expression
of another allele
10. _____ “children” from a genetic cross
11. _____ the alleles that are present in an
individual; uses letters
12. _____ having two of the same alleles; another
word for pure bred
13. _____ two alleles are both expressed together
A. allele
B. carrier
C. codominance
D. cross-pollinate
E. dihybrid cross
F. dominant
G. F1 generation
H. gene
I. genotype
J. heterozygous
K. homozygous
L. hybrid
M. incomplete dominance
N. law of independent
assortment
O. monohybrid cross
P. P generation
Q. pedigree
R. phenotype
S. polygenic trait
T. pure-bred
U. recessive
V. sex linked trait
14. _____ an allele does not get expressed because of another allele
15. _____ piece of a chromosome that is a code for one trait
16. _____ the organisms you start a genetic cross with
17. _____ a diagram that tracks genetic characteristics
18. _____ an organism that has two copies of the same allele; another word for
homozygous
19. _____ taking gametes from two different parents and examining the results
20. _____ having two different alleles; another word for hybrid
21. _____ genetic cross where only one trait is examined
22. _____ a description of how an organism looks; uses words
23. – 26. In guinea pigs, short hair (S) is dominant to long hair (s). Cross a
heterozygous short haired guinea pig with a homozygous long haired guinea
pig. Show the parents genotypes as well as the genotypic and phenotypic ratios
for the offspring.
23. Parents genotypes: short haired: _______
24. Punnett Square:
long haired: _______
25. Genotypic ratio:
26. Phenotypic ratio:
27. If this were a case of codominance, what would the results be?
28. If this were a case of incomplete dominance, what would the results be?
29. How are crosses with sex linked traits written differently?
30. What two pieces of information do you get phenotypically from a cross involving a
sex linked trait?
31. – 34. Left handedness is a sex linked trait found on the X chromosome. Right
handed (R) is dominant to left handed (r). Cross a left handed male with a
female carrying the trait for left handedness. Show the parents genotypes as
well as the genotypic and phenotypic ratios for the offspring.
31. Parents genotypes: Father: _______
Mother: _______
32. Punnett Square:
33. Genotypic ratio:
34. Phenotypic ratio:
35. – 38. In pea plants, Tall (T) is dominant to short (t) plants and purple flowers (P)
are dominant to white (p). Cross a pure bred tall plant with white flowers to a tall
plant with purple flowers that is a hybrid for both traits. Show the parents genotypes
as well as the genotypic and phenotypic ratios for the offspring.
35. Parents genotypes: Tall, white flowers: _______
36. Punnett Square:
Tall, purple flowers: _______
37. Genotypic ratio:
38. Phenotypic ratio:
39. – 43. To the right is a diagram called a
pedigree. Squares represent males and circles
represent females. Ones that are colored in
represent individuals with the trait in question.
39. – 40. Is this trait autosomal or sex linked?
How can you tell?
41. – 42. Is this trait dominant or recessive? How can you tell?
43. What are the genotypes for person I-1, and III-2? Use B for the dominant allele,
and b for the recessive.