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Worksheets04_11 ET: Genetics
Total questions: 15
Worksheet time: 12mins
In humans, blood type is determined by the A, B, and O alleles. The A and B alleles are
codominant to each other and dominant over the O allele. An individual with the AO genotype
and an individual with the BO genotype can produce offspring with which of the following
phenotypes?
O only
A, B or O only
A, B, AB or O
A or B only
In cattle the allele for cloven hooves (H) is dominant over the allele for mule-foot hooves (h). The phenotype for each trait is shown in this picture.
What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait?
75%
50%
100%
25%
Albinism is an autosomal recessive condition. Which circle graph shows the genotype
probability when an albino female mates with a male that is heterozygous for the albinism
trait?
In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair
color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having
horns (p).
What is the expected phenotypic ratio of the offspring of a BbPp × BbPp cross if these alleles
sort independently?
16 : black/polled
0 : black/horned
0 : red/polled
0 : red/horned
12 : black/polled
0 : black/horned
0 : red/polled
4 : red/horned
9 : black/polled
3 : black/horned
3 : red/polled
1 : red/horned
4 : black/polled
4 : black/horned
4 : red/polled
4 : red/horned
The inheritance pattern for an autosomal dominant trait is shown in the pedigree. Shaded symbols represent individuals that express the dominant trait. Based on the pedigree, what are the most like genotypes of individuals I-1 and I-2?
I-1: AA, I-2: Aa
I-1: aa, I-2: Aa
I-1: aa, I-2: AA
I-1: Aa, I-2: aa
Two identical alleles for a trait is known as
homozygous
heterozygous
mutation
codominance
A physical appearance is
genotype
heterozygous
phenotype
codominance
What does Pp mean?
two dominant alleles
heterozygous alleles
one dominant allele
two dominant and recessive alleles
Genotype is
stem height
feather color
physical appearance
genetic makeup
The term that relates to physical characteristics that are studied in genetics.
traits
offspring
generations
hybrids
Factors that control traits are
purebreds
genes
recessives
parents
Scientists call an organism with two different alleles for a trait
factor
purebred
trait
hybrid
An organisms's allele combination is known as
phenotype
mutation
hybrid
genotype
What does RR mean
two dominant alleles
heterozygous alleles
at least one dominant allele
one dominant and one recessive allele
