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Punnett Square Practice Quiz
Questions and Answers Latest Update.
1.Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?
- 100% tall
- 50% tall, 50% short
- 75% tall, 25% short
- 25% tall, 75% short
- Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?
- 100% Gg
- 50% GG, 50% Gg
- 25% GG, 50% Gg, 25% gg
- 75% Gg, 25% gg
- Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?
- 100% Pp (purple)
- 50% Pp (purple); 50% pp (white)
- 75% Pp (purple); 25% pp (white)
- 25% PP, 50% Pp, 25% pp
- 75% purple, 25% white
- In humans, brown eyes are dominant over blue eyes. What would be the allele key you would make from this information?
- B-brown b-blue
- B-blue b-brown
- BB-brown Bb-blue
- bb-brown Bb-blue
- If brown eyes are dominant over blue eyes, what would be the parent genotypes if two heterozygous brown-eyed persons were crossed?
- BB and bb
- BB and Bb
- Bb and Bb
- bb and Bb
- If brown eyes are dominant to blue eyes, what would be the genotype of the offspring if a homozygous brown-eyed individual is crossed with a homozygous blue-eyed?
- Which of the following is a phenotype?
- Aa
- red hair
- heterozygous
- DNA
- If Spongebob is homozygous for a yellow body (yellow dominant over blue), then his genotype would be …
- In the punnett square shown, what must the genotype of the missing parent be?
• BB
- In the punnett square shown, what is the genotypes of the two parents?
- RW and RR
- RW and WW
- RR and WW
- RW and RR
- T = tall an t = short TT and Tt would result in the following phenotype
An individual who has two of the same alleles for a trait. Both capital or both lower case homozygous An individual with two different alleles for a trait. One capital and one lower case. heterozygous The set of genes (alleles) a person possesses. genotype The physical appearance that is determined by the genes.Phenotype phenotype Tall is dominant (T). Short is recessive (t). What is the phenotype of “Tt”? tall Tall is dominant (T). Short is recessive (t). What is the phenotype of “TT”? tall Tall is dominant (T). Short is recessive (t). What is the phenotype of “tt”? short Purple flowers are dominant (P). White flowers are recessive (p). What is the phenotype of “PP”? purple Purple flowers are dominant (P). White flowers are recessive (p). What is the phenotype of “Pp”? purple Purple flowers are dominant (P). White flowers are recessive (p). What is the phenotype of “pp”? white Yellow is dominant (Y). Green is recessive (y). What is the genotype of a heterozygous parent? Yy Yellow is dominant (Y). Green is recessive (y). What is the genotype of a homozygous dominant parent? YY
Yellow is dominant (Y). Green is recessive (y). Create a Punnet Square to answer. What is the probability of an offspring of homozygous dominant parent and a heterozygous parent being yellow. 100% Yellow is dominant (Y). Green is recessive (y). Create a Punnet Square to answer. What is the probability of an offspring of homozygous dominant parent and a heterozygous parent being green. 0% Yellow is dominant (Y). Green is recessive (y). What is the genotype of a homozygous recessive parent? yy Round eye shape is dominant (R). Oval eye shape is recessive (r). What trait will be expressed (seen/phenotype) in a heterozygous parent? round Round eye shape is dominant (R). Oval eye shape is recessive (r). What trait will be expressed (seen/phenotype) in a homozygous recessive parent? oval Round eye shape is dominant (R). Oval eye shape is recessive (r). What trait will be expressed (seen/phenotype) in a homozygous dominant parent? round Round eye shape is dominant (R). Oval eye shape is recessive (r). What trait will be expressed in “Rr”? round Round eye shape is dominant (R). Oval eye shape is recessive (r). What trait will be expressed in “rr”? oval Round eye shape is dominant (R). Oval eye shape is recessive (r). What trait will be expressed in “RR”? round Which is the dominant allele? “Tt” T
Dominant Describes a trait that masks the other Recessive An allele for a trait that will be masked unless the organism is homozygous for this trait. Punnett Square A tool to predict the probability of certain traits in offspring that shows the different ways alleles can combine Phenotype An organism’s physical appearance, or visible traits. Genotype An organism’s genetic makeup, or allele combinations. Testcross An individual of unknown genotype is crossed with a homozygous recessive individual Dihybrid cross Cross between two organisms where two distinct traits are being studied. The principals of dominance, segregation, and independent assortment were described by. Gregor Mendel When chromosomes do not split correctly and can result in a genetic disorder, this is a cause of Nondisjunction Genetic diversity is a result of Crossing over A cross between homozygous purple-flowered and a homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates Dominance Genotype The genes of a organism that for one specific trait we use 2 letters to represent the genotype Genes in an organism
Capital Letter Represents the dominant form of a gene Lower Case Letter Abbreviation for the recessive form of the gene Phenotype Physical appearance of a trait in an organism Alleles Two forms of the same gene Alleles for a trait are located at corresponding positions on homologs chromosomes Symbol Genotype Name Phenotype RR Homozygous (Pure Dominat) Red Thoat Symbol Genotype Name Phenotype Rr Heterogenous (Hybrid) Red Thoat Symbol Genotype Name Phenotype rr Homozygous (Pure Recessive) White Thoat Why do we use two codes for the same trait? We use two forms of the same Capital and Lower Case Letter What are the steps to accurately make a Punnett Square?
- Determine genotypes of the parent organisms
- Write down cross
- Draw a square
- Split the letters of the genotype for each parent and put them
Capital or Lower Case Homozygous Two of the same alleles in the genotype (2 big letters or 2 little letters) Heterozygous One allele in the genotype Ex: Cc Mendel’s First Law: Law of Dominance Cross parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are are hybrids for a trait will have only dominant trait in the phenotype Mendel’s Second Law: Law of Segregation During the formation of gametes, the two alleles responsible for a trait separate from each other. After, traits are recombined at fertilization producing the genotype for the traits off the offspring Done after F1 offspring Miosis Sex cells each separate Mendel’s Third Law: Law of Independent Assortment Alleles for different traits are distributed to sex cells independently off of one another Dyhybird Cross Parents are hybrid for two different traits RrGg x RrGg = dealing with two different traits Law: Parent Cross: Offspring: Dominance TT x tt = Tall x Short 100% TT = Tall Law: Parent Cross: Offspring: Segregation Tt x Tt = Tall x Tall
75% = Tall 25% = Short Law: Parent Cross: Offspring: Independent Assortment RrGg x RrGg
