WorksheetsGenetics/Punnet Squares
Total questions: 31
Worksheet time: 19mins
In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits.
What is the phenotype of the offspring in box 3?
Brown
Black
A mixture of brown and black
None of the above
A cross of a red cow (RR) with a white bull (WW) produces a roan (red & white) offspring (RW) 100% of the time. What type of inheritance is this?
multiple alleles
codominance
complete dominance
incomplete dominance
Which of the following best describes both parents in the punnett square?
Black
Brown
Homozygous dominant
Homozygous recessive
The allele for having a bent pinky finger is dominant to the allele for having a straight pinky finger. If two people who are both heterozygous for the trait of a bent pinky finger have a child, what is the percent probability that the child will have straight pinky fingers?
ABCD
0%
25%
75%
100%
Which is the best model of meiosis and why?
Diagram B because 4 genetically identical diploid cells are produced.
Diagram A because 2 genetically different diploid cells are produced.
Diagram A because 2 genetically identical haploid cells are produced.
Diagram B because 4 genetically different haploid cells are produced.
In a genetics laboratory, two heterozygous tall plants are crossed. If tall is dominant over short, what are the expected phenotypic results?
100% Tall
50% Tall, 50% Short
75% Tall, 25% Short
25% Tall, 75% Short
In chickens, feather color shows codominance. A black and white spotted chicken is considered to be "erminette."
(Goes with All erminette chicken questions)
What would be the resulting phenotype ratio of the offspring produced in a cross between two erminette chickens?
1:0
4:0
1:2:1
1:1
What would be the phenotype percentages of a cross between a black chicken and an erminette chicken?
50% black, 50% erminette
25% black, 50% erminette, 25% white
50% black, 50% white
100% black
What are punnett squares used for?
Predicting the possible offspring of two parents
Determining the alleles of a specific gene
Identifying dominant and recessive traits
Determining an individuals genotype
What is the difference between a monohybrid and a dihybrid cross?
A monohybrid cross produces a single offspring, whereas a dihybrid cross produces two offspring
A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents
A monohybrid cross involves only one heterozygous parent whereas a dihybrid cross involves both heterozygous and homozygous parents
A monohybrid cross predits the outcome of one trait whereas a dihybrid cross predicts the outcome of two traits
Two models of meiosis are shown. What is the failure of chromosomes to properly separate during meiosis called?
crossing over
point mutation
frameshift mutation
nondisjunction
According to Mendel's Law of Segregation, an organism with the genotype aa could produce which of the following gametes?
A and A
AA and aa
a and a
A and a
In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (RW) offspring of red (RR) and white (WW) parents. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white?
Red x White
Roan x Roan
White x Roan
Red x Roan
The pedigree shows the inheritance of free earlobes an attached earlobes in five generation of a family. Free earlobes are caused by the dominant allele (F). Attached earlobes are recessive (f). Note: carriers are NOT half shaded.
What is the phenotype of Person #14?
no earlobes
attached earlobes
one attached earlobe, one free earlobe
free earlobes
Describe what is demonstrated in the karyotype.
A biological male with trisomy 21
A biological female with trisomy 21
A biological male with monosomy X
A biological female with monosomy Y
A homozygous red flowered snapdragon and a homozygous white flowered snapdragon are crossed. What will be true of their offspring?
All offspring will be red
All offspring will be white
All offspring will be pink
Half offspring will be white, half will be red
The model shows an important event in meiosis. What is demonstrated by the model and what is the outcome?
nondisjunction leading to genetic variation
nondisjunction leading to 4 identical chromosomes
crossing over leading to genetic variation
When roan cattle are mated, 25% of the offspring are red (RR), 50% are roan (RW), and 25% are white (WW). When the roan cattle are examined, it can be seen that the coat of the roan cow is made of both red and white hairs. What type of inheritance does this show?
Polygenic inheritance
Codominance
Incomplete dominance
Complete dominance
Gregor mendel crossed true-breeding purple flowered plants with true-breeding white flowered plants. All of the offspring were purple. What is the best explanation for this?
ABCD
The allele for purple flowered plants is recessive
The allele for white flowered plants is dominant
The allele for purple flowered plants is dominant
They were homozygous like their parents
Dihybrid crosses involve the study of the inheritance patterns related to two different traits. In guinea pigs, the allele for black fur (B) is dominant over the allele for brown fur (b), and the allele for short fur (F) is dominant over the allele for long fur (f). A dihybrid cross is setup as shown below.
What percentage of the offspring from the BbFf x bbff cross would be heterozygous for both traits?
0
4
8
16
Some traits are determined by more than two alleles. What are the possible gametes produced by an individual that is AaBb?
AB, Ab, aB, ab
BAa, Bb, AB, ab
AB, ab
AA, aa, BB, bb
What are different forms of a gene called?
Alleles
Chromosomes
Factors
Traits
What is the primary benefit of sexual reproduction?
Cells produced through sexual reproduction have no genetic material.
Sexual reproduction results in genetically identical clones of the parent cells.
Cells produced through sexual reproduction increase genetic variation.
Sexual reproduction requires both an egg and a sperm.
Use the diagrams to help you answer the question.
Which student has correctly identified the diagrams AND used the correct justification?
Becker has labeled the left diagram Mitosis and the right diagram Meiosis. They justified their reasoning because mitosis results in 2 genetically unique gametes, while meiosis results in 4 genetically identical somatic cells.
Devyn has labeled the left diagram Meiosis and the right diagram Mitosis. They justified their reasoning because meiosis results in 2 genetically identical gametes, while mitosis results in 4 genetically unique somatic cells.
Edgar has labeled the left diagram Meiosis and the right diagram Mitosis. They justified their reasoning because meiosis results in 4 genetically identical daughter cells, while mitosis results in 9 genetically unique daughter cells.
Alex has labeled the left diagram Mitosis and the right diagram Meiosis. They justified their reasoning because mitosis results in 2 genetically identical daughter cells, while meiosis results in 4 genetically unique daughter cells.
