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8th Grade Genetic Exam
Test Description: Genetics vocab and punnett squares
Instructions: Answer all questions to get your test result.
1) AA
A
Hetero recessive
B
Homo dominant
C
hetero
D
Homo recessive
2) bb
A
hetero recessive
B
hetero
C
homo recessive
D
homo dominant
3) Hh
A
hetero dominant
B
homo recessive
C
Hetero
D
homo dominant
4) In dogs, the gene for fur color has two alleles. The dominant allele (F) codes for grey fur and the recessive allele (f) codes for black fur. The female dog is heterozygous. The male dog is homozygous recessive. How many puppies are grey?
A
75%
B
100%
C
25%
D
50%
5) In dogs, the gene for fur color has two alleles. The dominant allele (F) codes for grey fur and the recessive allele (f) codes for black fur. The female dog is black. The male dog is black. What could their genotypes be?
A
FF or Ff
B
ff
C
FF or ff
D
Ff or ff
6) In dogs, the gene for fur color has two alleles. The dominant allele (F) codes for grey fur and the recessive allele (f) codes for black fur. The female dog is heterozygous. The male dog is heterozygous. How many puppies are grey?
A
75%
B
50%
C
100%
D
25%
7) In fruit flies, red eyes are dominant (E). White-eyes are recessive (e). A female fly has white eyes, and the male fly is homozygous dominant for red eyes. What must the females genotype be?
A
ee
B
Ee
C
EEe
D
EE
8) Rr x rr What are the genotypes of the offspring?
A
75% Rr 25% rr
B
50% Rr 50% rr
C
100% rr
D
100% Rr
9) What is a dominant trait?
A
The trait that hides in the background (lower case letter)
B
the physical appearance of a trait
C
The letters that represent the different forms of a gene
D
The trait that overshadows and is expressed (capital letter)
10) Recessive
A
The letters that represent the different forms of a gene (d=Dimples)
B
The trait that overshadows and is expressed (capital letter)
C
The trait that hides in the background (lower case letter)
D
the physical appearance of a trait
11) The letters that represent the different forms of a gene (d=Dimples)
A
Phenotype
B
Allele
C
Dominant
D
Genotype
12) Phenotype
A
Homozygous
B
Physical appearance of a trait (what you can see)
C
One allele
D
Pair of alleles
13) Combination of alleles (letters) DD, Dd,dd
A
Homozygous
B
Phenotype
C
Heterozygous
D
Genotype
14) Two alleles/letters for one trait that are different
A
Heterozygous
B
Heterozygous recessive
C
Homozygous recessive
D
Homozygous dominant
15) Two alleles/letters for one trait that are the same (DD, dd)
A
Homozygous
B
Heterzygous
C
genotype
D
phenotype
*select an answer for all questions
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