WorksheetsGenetics
Total questions: 30
Worksheet time: 53mins
A DNA molecule is shaped like a
long, thin rod
straight ladder
triple helix
double helix
What does the notation TT mean to geneticists?
homozygous dominant alleles
heterozygous alleles
homozygous recessive alleles
one dominant and one recessive alleles
The different forms of a gene are called
alleles
chromosomes
masks
traits
What does a Punnett square show?
all the possible outcomes of a genetic cross
only the dominant alleles in a genetic cross
only the recessive alleles in a genetic cross
all of Medel's discoveries about gnetics crosses
The passing of traits from parent to offspring
Heredity
Genetics
Hybrid
Probability
Who was the father of genetics
Sagan
Issac Newton
Gregor Mendel
C.jenkins
The study of heredity and the variation of inherited characteristics
gene
genetics
meiosis
hybrid
Which is heterozygous?
Tt
TT
Which is homozygous?
Zz
SS
A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?
100% BB
75% BB and 25%Bb
50 % BB and 50% Bb
50% Bb and 50% bb
Which of the following is a phenotype?
BB
Bb
bb
Blue eyes
What is a phenotype?
The genetic make up (code)
The physical trait
Having two of the same genes for the trait (sometimes called purebred).
homozygous
heterozygous
protein
chromosome
Having two different genes for a trait (sometimes called hybrid).
protein
homozygous
heterozygous
genotype
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
0 %
25%
50%
75%
G = green, g = yellow
The genotype for a yellow plant is...
GG
Gg
gg
all of the choices result in yellow
Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?
50% tall and 50% short
75%tall and 25% short
100%short
What does heterozygous mean?
An organism that has the same genes for a trait (TT or tt)
An organism that has different genes for a trait (Tt)
When neither gene is fully dominant; offspring is a mixture of both
the different forms of a trait (hair color--> brown, blonde, red
How many times in meiosis does the cell divided?
2
4
3
1
The hydra is a very small, simple animal that lives in water. Hydras reproduce asexually by budding, a process in which a bud breaks off an adult hydra and floats away.Which of the following best describes a hydra bud?
A hydra bud is genetically identical to the parent hydra.
A hydra bud contains genetic material from its two parents.
A hydra bud has half as much genetic material as the parent hydra.
A hydra bud has different mutations than the parent hydra.
How many generations are shown in this pedigree?
1
2
3
4
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
8
5
2
3
One trait that is ALWAYS present and causes the other traits to disappear is a ________________________
recessive trait
aggressive trait
absent trait
dominant trait
True or False: Recessive traits are ALWAYS present
True
False
