Python Scripts for Generating Genetics Homework/Quiz problems

• genetics-problems
• Table of Contents
  • Blood Types
    • blood_type_offspring.py
    • blood_type_mother.py
    • hla_genotype.py
  • Gametes
    • gametes_unique.py
  • Epistasis
    • epistasis_test_cross.py
    • epistasis_inverse_test_cross.py
  • X-linked disorders
    • poisson_flies.py
  • Chi-Squared Analysis
    • Table of Chi-Squared (χ²) Critical Values
    • chi_square_errors.py

Created by gh-md-toc

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What will the results of a blood test look like for a person with O- blood type?

• A.
• B.

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1. For the ABO blood group in humans, the i^A and i^B alleles are codominant and the i allele is recessive. If a female ♀ with type A blood marries a male ♂ with type O blood, which of the following blood types could their children possibly have? Check all that apply.

• A. Type O blood
• B. Type A blood
• C. Type B blood
• D. Type AB blood

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2. For the ABO blood group in humans, the i^A and i^B alleles are codominant and the i allele is recessive. A father ♂ who has blood type AB has a son ♂ who has blood type A, which of the following blood types could the mother ♀ possibly have? Check all that apply.

• A. Type O blood
• B. Type A blood
• C. Type B blood
• D. Type AB blood
• E. None of the above are possible

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3. A mother has a HLA genotype of A2,B5,C6 on one chromosome and A1,B1,C3 on the other. The father has a HLA genotype of A7,B9,C2 on one chromosome and A8,B3,C5 on the other. Which one of the following is a possible genotype for one of their offspring?

• A. A2,A8,B1,B9,C2,C3
• B. A1,A2,B1,B5,C3,C6
• C. A2,A7,B5,B9,C2,C6
• D. A7,A8,B3,B9,C2,C5
• E. A1,A7,B1,B3,C5,C6

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1. How many unique gametes could be produced through independent assortment by an individual with the genotype AA Bb cc dd Ee Ff Gg ?

• A. 2² = 4
• B. 2³ = 8
• C. 2⁴ = 16
• D. 2⁵ = 32
• E. 2⁶ = 64

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1. In a specific cross, F₂ progeny exhibit a modified dihybrid ratio of 15:1 (instead of 9:3:3:1 ). What phenotypic ratio would be expected from a test-cross with an individual from the F₁ progeny?

• A. 1:4
• B. 2:2 or 1:1
• C. 4:1
• D. 3:1
• E. 2:1
• F. 1:3

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2. An F₁ heterozygote individual from dihybrid cross is used for a test-cross. The progeny from the test-cross exhibited a modified ratio of 3:1 (instead of 1:1:1:1). What phenotypic ratio would be expected in the F₂ progeny if the dihybrid cross is continued?

• A. 13:3
• B. 12:4
• C. 11:5
• D. 10:6
• E. 9:7

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1. The white-eyed phenotype is an X-linked recessive disorder in fruit flies. The red allele, +, is dominant to the white allele, w. The offspring of size 400 from the mating of a single female and a single male are shown in the table below:

What are the genotypes of the parents in this cross?

• A. homozygous wildtype female (++) and male of unknown genotype
• B. heterozygous female (+w) and wildtype male (+–)
• C. heterozygous female (+w) and mutant male (w–)
• D. homozygous mutant female (ww) and wildtype male (+–)
• E. homozygous mutant female (ww) and mutant male (w–)

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1. The final result gives the chi-squared (χ²) test value of 3.58 with 3 degrees of freedom. Using the Table of χ² Critical Values and a level of significance α=0.50, we get a critical value of 2.37. Since the chi-squared (χ²) test value of 3.58 is greater than the critical value of 2.37, the null hypothesis was rejected.

Your lab partner has done a chi-squared (χ²) test for your lab data (above), for the F₂ generation in a standard dihybid cross. They wanted to know if the results confirm the expected phenotype ratios, but as usual they did something wrong. Where did they do wrong?

• A. the expected progeny for the null hypothesis is incorrect
• B. the degrees of freedom is wrong
• C. the numbers in the calculation have to be squared
• D. the wrong numbers in the calculation were used for division
• E. the wrong rejection criteria was used

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A women has nine (9) children, what is the probability that she has exactly five (5) boys and four (4) girls?