Complete Dominance
Purple flowers (P) are dominant to white flowers. Write all the possible genotypes for a purple flower.
PP and Pp
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Snapdragons can be pink, white, or red. Cross two parents that are pink. What are the chances that the offspring will have white flowers?
1/4 or 25%
What are the possible genotypes for A type blood?
AA or Ao
Which alleles of blood prove that blood type is a codominant trait?
A allele and B allele.
(Both A allele and B allele are dominant together to form AB blood)
Cow can have red hair, white hair, or red and white patches of hair.
What time of inheritance pattern is shown?
A. incomplete dominance
B. codominance
C. complete dominance
B. codominance
Because both red hair and white hair are seen together at the same time
Tall stems (T) are dominant to short stems in pea plants. The offspring are all short stemmed. What are the genotypes of the parents?
If T = tall stem and t = short stem, then both parents are tt.
What is the memory clue for incomplete dominance?
Blend in
One parent has A blood, the other has B blood. What are the parents' genotypes if they produce an O type baby?
Ao and Bo
What is the memory clue for codominance?
Co= Together
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A straight thumb is dominant to having a hitchhiker's thumb. Both parents are heterozygous for a straight thumb. What are the chances (in fractions) a straight thumb?
3/4
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Having freckles is dominant to not having freckles. One parent has no freckles and the other parent is heterozygous for freckles. What is the probability in percent that they will have a child with freckles?
50%
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Andalusian fowls (birds) can have black, white, or gray feathers. Cross a parent that has black feathers, and a parent who has white feathers. What are the chances (in percent) that they will have offspring with gray feathers?
100%
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Grasshoppers can have red stripes, yellow stripes, or red and yellow stripes.
Two heterozygous striped grasshoppers mate. What are the chances in fraction that they will have offspring with red stripes?
1/4
Mice can have black fur, white fur, and gray fur.
What type time of inheritance pattern is shown?
incomplete dominance
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Mice can have black fur, white fur, or gray fur.
A gray furred mouse mates with a white furred mouse. What are the chances in fraction that they will have a gray furred baby?
2/4 or 1/2
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Dimples is dominant to not having dimples.
Martha has dimples and her husband Craig doesn't have dimples. They have 3 child, all who are heterozygous for having dimples.
What are Martha and Craig's genotypes?
You can choose any letter to represent this trait as long as the allele for dimples is capitalized and the allele for no dimples is lowercase
Martha = homozygous dominant or DD
Craig = homozygous recessive or dd
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Hair texture can be curly (C), straight (S), or wavy. What are the parents' genotypes if 50% of the offspring have curly hair and 50% of the offspring have wavy hair?
(One parent is curly and one parent has wavy ) CC and CS
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Lubber grasshoppers can have red stripes, yellow stripes, or red and yellow stripes.
A parent with red and yellow stripes mates with another grasshopper with yellow stripes. What are the chances in percent that they will have offspring with a homozygous genotype?
50%
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Having unattached earlobes is dominant to having attached earlobes.
Rebecca has attached earlobes. Her mom has attached earlobes and her dad has unattached earlobes.
What are the genotypes of her parents?
You can use any letter as long as the allele for unattached earlobes is capitalized and the allele for attached earlobes is lowercase.
Mom: uu
Dad: Uu
Set the timer for two minutes.
Cow can have red hair, white hair, or red and white patches of hair.
When 2 cattle are mated, 25% of the offspring have red hair, 50% have red and white patches of hair, and 25% have white hair. Create a punnett square to determine the parents’ genotypes.
Both parents are heterozygous (RW)
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Purple flowers are dominant to white flowers. What are the parents' genotypes if the offspring are 3/4 purple flowers and 1/4 white flowers?
Both parents are Pp
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Hair texture can be curly (C), straight (S), or wavy. What are the parents' genotypes if all offspring have wavy hair?
CC and SS. One parent has straight and one parent has curly hair
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One parent is AB and another parent is O. What are the chances that they would produce an O type baby?
Prove your answer by creating a Punnett Square
0%
Name two reasons why Mendel chose pea plants to study genetics.
They were:
- small and easy to grow
- can reproduce many offspring
- only have 7 traits that make them different from each other
Set timer for 1 minute.
Name 2 similarities between mitosis and meiosis.
Both divide cells to make more cells.
Both have cells go through interphase before dividing.
If you have a different similarity, you can get the points if you find it in your notes to prove your answer.