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Mendelian Genetics Problems (Grade 10)

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Mendelian Genetics Problems

1. 
What is the probability of offspring being red in color in a cross between a homozygous dominant red parent and one that is homozygous recessive white?
Table 2x2
  1. 25%
  2. 30%
  3. 50%
  4. 100%
2. 
If red is dominant to white, what is the expected phenotypic ratio of offspring in a cross between two parents who are heterozygous for this color?
Table 2x2
  1. 1 red: 2 white: 1 pink
  2. 2 red: 2 white
  3. 4 red: 0 white
  4. 3 red: 1 white
3. 
Albinism is a condition that results when an organism does not produce the pigment melanin. The allele for albinism is recessive (a) and not sex-linked. Suppose an albino female mated with a normal male whose father was an albino. What was the genotype of the normal rabbit?
Table 2x2
  1. aa
  2. cannot be determined
  3. Aa
  4. AA
4. 
In humans, four blood types are possible (A,B, AB, and O). Those with A or B blood can be either homozygous dominant (AA, BB) or heterozygous (Ai, Bi). Type AB blood is considered a codominant condition and type O blood lacks the A or B antigen (ii).

A man who has type B blood and woman who has type A blood could have children with which of the following genotypes?
Table 2x2
  1. A or B only
  2. AB only
  3. AB or O
  4. A, B, or O
  5. A, B, AB, or O
5. 
Leonard and Penny both have freckles but their son does not. How is it possible that two parents, each expressing a trait, can have offspring that do not show the trait?



6. 
In fruit flies, one of the genes for eye color is found on the X chromosome (making it a sex-linked trait). The allele for red eyes is dominant over that for white. Using the notation R, r, and O, what would be the possible phenotypes of a cross between a heterozygous red female and a red-eyed male?
Table 2x2
  1. All offspring would have red eyes regardless of sex.
  2. The females would all have red eyes and the males would have white eyes.
  3. The females would all have red eyes and the males would have either red or white eyes.
  4. The males would have white eyes and the females would have either red or white eyes.
7. 
Guinea pigs have dark fur (D) or white fur (d). They also can have a rough coat (R) or a smooth coat (r). If two guinea pigs that are heterozygous for both traits are crossed, what is the expected phenotypic ratio for the offspring?
Table 4x4
  1. All of the offspring will have dark fur and a rough coat.
  2. All of the offspring will have white fur and a smooth coat.
  3. There will be a mixture of dark/rough, dark/smooth, white/rough, and white/smooth offspring.
  4. There will only be dark/rough and white/smooth offspring produced.
8. 
When red-flowered snapdragons are crossed with white-flowered snapdragons, the offspring all appear pink. This indicates that the alleles for flower color exhibit incomplete dominance. What offspring would be expected from a cross from two pink individuals?
Table 2x2
  1. All of the offspring could be red.
  2. All of the offspring could be pink
  3. Both red and white offspring could appear.
  4. Both white and pink offspring could appear.
9. 
If a cross is performed and the phenotypic ratio comes out to be 9 dominant/dominant: 3 dominant/recessive: 3 recessive/dominant: 1 recessive/recessive for the traits, what can be predicted about the genotypes of the parents?
Table 4x4
  1. Both parents had an AABB genotype.
  2. One parent was AABB and the other was aabb.
  3. One parent was AaBb and the other was AABB
  4. Both parents had an AaBb genotype.
10. 
A man with the genotype AABBCCDDEE is crossed with a woman with the genotype aabbccddee. What is the expected genotypic ratio of their offspring?
  1. 50% homozygous dominant : 50% homozygous recessive
  2. 100% homozygous recessive : 0% homozygous dominant
  3. 100% heterozygous : 0% homozygous dominant : 0% homozygous recessive
  4. 25% heterozygous : 50% homozygous dominant : 25% homozygous recessive
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