Genetics Mini Quiz: COBLEY

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| By Sablin05

Sablin05

Community Contributor

Quizzes Created: 1 | Total Attempts: 205

Questions: 10 | Attempts: 205 | Updated: Mar 21, 2023

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Questions and Answers

1.

Black fur(B) in guinea pigs is dominant over white fur(b). Create a punnett square that crosses two Heterozygous Guinea Pigs. What percentage of offspring will be white?
- A.
  
  25%
- B.
  
  100%
- C.
  
  50%
- D.
  
  75%
Correct Answer
A. 25%

Explanation
When crossing two heterozygous guinea pigs (Bb x Bb), there is a 25% chance of producing offspring with white fur. This is because the lowercase "b" represents the recessive allele for white fur, and in order for an offspring to have white fur, it must inherit the "b" allele from both parents. Since both parents are heterozygous (Bb), there is a 25% chance of each offspring inheriting the "b" allele from both parents and therefore having white fur.

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2.

HH is heterozygous?
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
3.

Punnett squares are used by geneticists to determine the probability of different offspring genotypes. In the one shown below, what letter(s) belong in the lower right box?
- A.
  
  S
- B.
  
  AA
- C.
  
  Aa
- D.
  
  Aa
Correct Answer
C. Aa

Explanation
In a Punnett square, the different combinations of alleles from the parents are shown to determine the probability of different genotypes in the offspring. In this case, the Punnett square shows the cross between two individuals with genotype AA and aa. The lower right box represents the possible genotype of the offspring. Since the lowercase letter "a" represents the recessive allele, and both parents have the genotype aa, it is certain that the offspring will also have the genotype aa.

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4.

The punnett square shown below is set up correctly.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The punnett square shown below is not set up correctly.

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5.

Determine the phenotype for each genotype using the information provided about Squidward.A long nose is dominant to a short nose. What type of noses are represented by the genotypes below?a. NN = _________b. Nn = _________c. nn = _________
- A.
  
  A. long b. short c. short
- B.
  
  A. short b. short c. long
- C.
  
  A. long b. long c. short
- D.
  
  A. short b. short c. long
Correct Answer
C. A. long b. long c. short

Explanation
The genotype NN represents a long nose because it is homozygous dominant, meaning it has two copies of the dominant allele. The genotype Nn represents a long nose as well because it is heterozygous, meaning it has one copy of the dominant allele. The genotype nn represents a short nose because it is homozygous recessive, meaning it has two copies of the recessive allele.

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6.

You are studying flowers - the purple flowers are dominant (P) and the white flowers are recessive (p). Make a punnett square to cross a PP father and a PP mother and then answer the question below.What are the colors of the parents and the offspring?
- A.
  
  Parents are both purple and the offspring are a mix of white and purple.
- B.
  
  Parents are both purple and the offspring are all purple.
- C.
  
  The parents are a mix of purple and white and the offspring are all purple.
- D.
  
  The parents are all white and the offspring are all white.
Correct Answer
B. Parents are both purple and the offspring are all purple.

Explanation
The given answer correctly states that the parents are both purple (PP) and the offspring are all purple. This is because in the punnett square, when both parents have the dominant purple allele (P), there is no possibility for the recessive white allele (p) to be passed on to the offspring. Therefore, all the offspring will inherit the dominant purple allele from both parents, resulting in them being all purple.

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7.

Some people have dimples. For this example, dimples are dominant (D) and no dimples is recessive (d). What is the genotype of the missing parent AND how many offspring have dimples?
- A.
  
  Genotype of parent = DD 4 offspring have dimples
- B.
  
  Genotype of missing parent = Dd 2 offspring have dimples
- C.
  
  Genotype of missing parent = dd 0 offspring have dimples
- D.
  
  Genotype of missing parent = Dd 3 of the offspring have dimples
Correct Answer
D. Genotype of missing parent = Dd 3 of the offspring have dimples

Explanation
The given information states that dimples are dominant (D) and no dimples are recessive (d). The genotype of the known parent is DD. Since the offspring have dimples, it means that they inherited the dominant allele from the known parent. Therefore, the missing parent must have at least one dominant allele (D) in order for the offspring to have dimples. The genotype of the missing parent is therefore Dd. The answer also states that 3 of the offspring have dimples, which supports the conclusion that the missing parent has the genotype Dd.

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8.

The phenotype of a gene is the physical trait that shows and the genotype is the gene code for that trait.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The explanation for the given correct answer is that the phenotype refers to the observable physical traits or characteristics of an organism, while the genotype is the genetic code or combination of alleles that determine those traits. In other words, the phenotype is what we can see or measure, such as hair color or height, while the genotype is the underlying genetic information that determines the phenotype. Therefore, it is true that the phenotype of a gene is the physical trait that shows, and the genotype is the gene code for that trait.

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9.

When looking at cows, spotted fur is dominant (F) and black fur is recessive (f). A farmer crosses a heterozygous spotted cow with black cow. What is the genotype for each cow?
- A.
  
  Spotted Cow = FF Black Cow = ff
- B.
  
  Spotted Cow = ff Black Cow = Ff
- C.
  
  Spotted Cow = Ff Black cow = ff
- D.
  
  Spotted Cow = Ff Black cow = FF
Correct Answer
C. Spotted Cow = Ff Black cow = ff

Explanation
The correct answer is that the genotype for the spotted cow is Ff and the genotype for the black cow is ff. This is because spotted fur is dominant (F) and black fur is recessive (f). The spotted cow is heterozygous, meaning it has one dominant allele (F) and one recessive allele (f). The black cow is homozygous recessive, meaning it has two recessive alleles (ff).

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Feb 17, 2017

Quiz Created by
Sablin05

Genetics Mini Quiz: Cobley

Black fur(B) in guinea pigs is dominant over white fur(b). Create a punnett square that crosses two Heterozygous Guinea Pigs. What percentage of offspring will be white?

HH is heterozygous?

Punnett squares are used by geneticists to determine the probability of different offspring genotypes. In the one shown below, what letter(s) belong in the lower right box?

The punnett square shown below is set up correctly.

Determine the phenotype for each genotype using the information provided about Squidward.A long nose is dominant to a short nose. What type of noses are represented by the genotypes below?a. NN = _____b. Nn = _c. nn = _____

You are studying flowers - the purple flowers are dominant (P) and the white flowers are recessive (p). Make a punnett square to cross a PP father and a PP mother and then answer the question below.What are the colors of the parents and the offspring?

Some people have dimples. For this example, dimples are dominant (D) and no dimples is recessive (d). What is the genotype of the missing parent AND how many offspring have dimples?

The phenotype of a gene is the physical trait that shows and the genotype is the gene code for that trait.

When looking at cows, spotted fur is dominant (F) and black fur is recessive (f). A farmer crosses a heterozygous spotted cow with black cow. What is the genotype for each cow?