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Worksheetsheredity review
Total questions: 25
Worksheet time: 13mins
______ are different forms of the same gene that are always found on the same position of two homologous chromosomes.
alleles
chromatids
loci
nucleotides
The karyotype, or chromosomal profile, for humans is shown. A karyotype can be used to investigate genetic disorders. Which of the following is true of this individual?
The individual suffers from Klinefelter syndrome, a genetic condition that results when a boy is born with an extra copy of the X chromosome.
The individual suffers from Trisomy 21, a chromosomal disorder that results in three copies of chromosome 21.
The individual suffers from Cri du chat syndrome, a rare genetic disorder caused by missing pieces on a particular chromosome.
The individual appears to have no chromosomal mutations.
In pea plants, being tall (T) is dominant over being short (t). What law BEST explains why a pea plant with Tt will show only the dominant phenotype?
Law of Dominance
Law of Segregation
Law of Independent Assortment
Law of Filial Generations
A tall pea plant (Tt) is crossed with a short pea plant (tt). What percentage of their offspring would be short?
0%
25%
50%
100%
In horses, black (B) is the dominant color; brown (b) is the recessive color. Consider the cross seen here, between two black horses (Bb). What is the probability that these two horses will have a foal that is brown?
0%
25%
50%
100%
In horses, black (B) is the dominant color; brown (b) is the recessive color. What is the genotype of the brown foal from the Punnett square above?
BB
Bb
bb
bB
What is the phenotype of the parent horses (Bb) from the Punnett square above?
black
brown
BB
Bb
The Punnett square below shows the cross between two pea plants. R represents the dominant gene for round seeds, and r represents the recessive gene for wrinkled seeds. Which phrase describes the parents’ genotypes for this trait?
both heterozygous
one homozygous recessive and one heterozygous
one homozygous dominant and one heterozygous
one homozygous dominant and one homozygous recessive
What percentage of offspring from this cross would have round seeds?
0%
25%
50%
75%
The cross from the previous question above (Rr x Rr) would have a phenotypic ratio of
1 round; 3 wrinkled
2 round; 2 wrinkled
3 round; 1 wrinkled
4 round; 0 wrinkled
1What is represented by a white square?
a female with the trait
a male with the trait
a female without the trait
a male without the trait
How many grandchildren do the original couple (I-1 and I-2) have?
6
3
5
0
This pedigree is tracking cystic fibrosis, which is a recessive genetic disease. Based on this information, what would be the genotype of the grandmother (I-2)?
FF
Ff
ff
cannot be determined
Suppose individual III-4 produces offspring with a heterozygous carrier of the trait. Which of the following would be the phenotypic ratio of the offspring?
1:1 (carrier: cystic fibrosis)
a. 1:2:1 (normal: carrier: cystic fibrosis)
1:0 (cystic fibrosis)
3:1 (cystic fibrosis: normal)
Which Mendelian law of inheritance states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
the law of independent assortment
the law of dominance
the law of segregation
the law of incomplete dominance
Humans can have type A blood, type B blood, type AB blood, or type O. Which of the following is a possible genotype for an individual with type B blood?
IBIi
IAIB
ii
a. IAIi
If an organism inherits one dominant allele and one recessive allele for eye color (Bb), their genotype would be:
haploid
homozygous
heterozygous
homologous
Which of the following is a homozygous recessive genotype?
AA
Aa
aA
aa
A father has type A blood (IAIi) and the mother has type AB blood (IAIB). Which blood type would be impossible for their children to have?
A
B
O
AB
The following pedigree represents an inheritance pattern for an autosomal dominant trait. Shaded symbols represent individuals that express the dominant trait. Based on this pedigree, what are the most likely 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
Which statement describes asexual reproduction but not sexual reproduction?
New organisms are formed only after fertilization.
Daughter cells contain the same genetic information as parent cells.
A single cell will not develop into a full organism.
Daughter cells contain half the genetic material of the parent cell.
Farmer Dan grows corn for a living. One day, Farmer Hal suggests to Farmer Dan that he should clone his best corn plant in order to produce more ears of corn per plant. Farmer Dan is not sure about Farmer Hal’s idea. Why might Farmer Dan be hesitant to clone his corn?
Cloning the corn plants is difficult and expensive to accomplish.
The cloned corn would not have the same taste as the original plants.
Cloning eliminates the ability to sexually reproduce and provide genetic variability.
a. Cloned plants would have increased genetic variability as well as a shortened life expectancy
In rabbits, white fur is a recessive trait. The rabbit in the picture is white. Based on this fact, what statement BEST describes this rabbit's genotype?
It must have the genotype Bb.
It is homozygous for fur color
It cannot have the genotype bb.
It is heterozygous for fur color.
The image below shows asexual reproduction in hydra. According to the illustration, all offspring are _____.
genetically different from the parent
genetically identical to the parent
slightly similar to the parent
genetically varied
1Which of the following is NOT an example of a mutagen that could cause a genetic mutation in an organism?
UV radiation
infectious agents
chemicals
RNA
