KEY FOR QUIZ 1:
GENETICS AND BREEDING
Topic # 3033
_f_ Genetic constitution of an individual
a. allele
b. dominant
_h_ The physical appearance of the animal because
of its genetic makeup
c. gene
d. recessive
e. heterozygous
_g _ Animal that carries a gene with two identical alleles
f. genotype
g. homozygous
_c _ Specific region of a chromosome which is capable of
determining the development of a specific trait the is
composed partially or wholly of DNA
_b_ Refers to genes which hide or mask the presence of other
genes
h. phenotype
Construct a Punnett square with a heterozygous male with a homozygous dominant
female. Using B as the dominant trait and b as the recessive trait. Give the genotypic and
phenotypic ratio.
Genotypic ratio: 4.0
Phenotypic ratio: 2:2 or 1:1
BB
B BB BB
B Bb Bb
Construct a Punnett square using the same parents from above. Another allele is
introduced. Use H as the dominant allele and h as the recessive allele. The female is
homozygous recessive and the male is heterozygous. Give the genotypic and phenotypic
ratio.
BH BH Bh Bh Genotypic Ratio: 8:4:4 or 2:1:1
Bh BBHh BBHh BBhh Bbhh Phenotypic Ratio: 4:4:4:4: or 1:1:1:1
Bh BBHh BBHh BBhh BBhh