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Hardy-Weinberg
Punnet Squares
Mendel
Incomplete Dominance
Genetic Disorders
100
Within a population of butterflies, the color brown (B) is dominant over the color white (b). And, 40% of all butterflies are white. What is the percentage of butterflies that are heterozygous.
What is 47%
100
Mr. Krabbs and his wife recently had a Lil’ Krabby, but it has not been a happy occasion for them. Mrs. Krabbs has been upset since she first saw her new baby who had short eyeballs. She claims that the hospital goofed and mixed up her baby with someone else’s baby. Mr. Krabbs is homozygous for his tall eyeballs, while his wife is heterozygous for her tall eyeballs. Some members of her family have short eyes, which is the recessive trait. Did the hospital make a mistake? Explain your answer.
What is Yes. There is a 50% chance of TT and a 50% chance of Tt, both of which are dominant tall eye traits.
100
Another word for a gene
What is an allele
100
In northeast Kansas there is a creature know as a wildcat. It comes in three colors, blue, red, and purple. This trait is controlled by a single locus gene with incomplete dominance. A homozygous (BB) individual is blue, a homozygous (bb) individual is red, and a heterozygous (Bb) individual is purple. What would be the genotypes of the offspring if a blue wildcat were crossed with a red one?
What is Bb
100
Trisomy 21, typically is associated with growth delays, characteristic facial features, and mild to moderate intellectual disabilities. Usually have the mental capacity of an 8 year old.
What is Down Syndrome
200
There are 100 students in a class. Ninety-six did well in the course whereas four blew it totally and received a grade of F. Sorry. In the highly unlikely event that these traits are genetic rather than environmental, if these traits involve dominant and recessive alleles, and if the four (4%) represent the frequency of the homozygous recessive condition, please calculate the frequency of the recessive allele.
What is .2
200
In humans, brown eyes (B) are dominant over blue (b)*. A brown-eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eyed. Draw the Punnett square that illustrates this marriage. What is the man’s genotype? What are the genotypes of the children?
What is The man's genotype is Bb and the children's genotypes are Bb, Bb, and bb.
200
The actual physical appearance of an individual.
What is phenotype
200
In Japanese four o'clock plants red (R) color is incompletely dominant over white (r) flowers, and the heterozygous condition (Rr) results in plants with pink flowers. Give phenotypic and genotypic ratios of the offspring if you cross a pink plant and a red plant
What is 50% red (RR), and 50% pink (Rr)
200
This is a deletion of part of chromosome 5. Children have a distinctive cat like cry when infants, and have distinctive facial features. The disease is extremely rare.
What is Cri Du Chat Syndrome
300
After graduation, you and 19 of your closest friends (lets say 10 males and 10 females) charter a plane to go on a round-the-world tour. Unfortunately, you all crash land (safely) on a deserted island. No one finds you and you start a new population totally isolated from the rest of the world. Two of your friends carry (i.e. are heterozygous for) the recessive cystic fibrosis allele (c).Assuming that the frequency of this allele does not change as the population grows, what will be the incidence of cystic fibrosis on your island?
What is .1
300
In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, what fraction of the offspring should have spherical seeds?
What is 3/4 should have spherical seeds.
300
The idea that different pairs of alleles are passed to offspring separately.
What is Mendel's law of independent assortment.
300
In some cats the gene for tail length shows incomplete dominance. Cats with long tails and cats with no tails are homozygous for their respective alleles. Cats with one long tail allele and one no tail allele have short tails. Give phenotypic and genotypic ratios of the offspring if you cross a cat with a long tail and a cat with no tail?
What is 100% Cats with short tails (Tt).
300
Phenylketonuria (PKU) is an autosomal recessive metabolic genetic disorder characterized by homozygous or compound heterozygous mutations in the gene for the hepatic enzyme phenylalanine hydroxylase (PAH), rendering it nonfunctional,can lead to intellectual disability, seizures, and other serious medical problems
What is PKU
400
Cystic fibrosis is a recessive condition that affects about 1 in 2,500 babies in the Caucasian population of the United States. Please calculate the frequency of the dominant allele.
What is .98
400
If two parents are heterozygous for a genetically inherited dominant trait, what is the probability that they will have a child together who has this trait in his or her phenotype
What is a 50% chance
400
The common ratio of 9:3:3:1 comes from this.
What is a dihybrid cross between heterozygous traits.
400
A curly haired person and a straight haired person mate and all their offspring have wavy hair (note that wavy hair is a phenotype in between that of the curly and straight haired individuals). What would be the result of a cross between two wavy haired individuals? (give phenotype %’s)
What is 25% straight hair, 25% curly hair and 50% wavy hair.
400
A life-threatening genetic disease that primarily affects the lungs and digestive system. An estimated 30,000 children and adults in the United States have this disease. A defective gene and its protein product cause the body to produce unusually thick, sticky mucus.
What is Cystic Fibrosis
500
You have sampled a population in which you know that the percentage of the homozygous recessive genotype (aa) is 36%. Using that 36%, calculate the frequencies of the AA and Aa genotypes.
What is .16 and .48
500
SpongeBob’s mother is so proud of her son and his new wife, SpongeSusie, as they are expecting a little sponge. She knows that they have a 50% chance of having a little roundpants, but is also hoping the new arrival will be blue (a recessive trait) like SpongeSusie and many members of her family. If SpongeBob is heterozygous for his yellow body color, what are the chances that the baby sponge will be blue?
What is a 25% chance
500
The idea that for any particular trait, the pair of alleles of each parent separate and only one allele from each parent passes to an offspring
What is segregation.
500
Coat color in mice is incompletely dominant. Yellow and white-colored mice are homozygous, while cream-colored mice are heterozygous. If two cream-colored mice mate, what phenotypic ratio can we expect of their offspring?
What is 25% yellow, 25% white, and 50% cream
500
They tend to block blood flow in the blood vessels of the limbs and organs. Blocked blood flow can cause pain and organ damage. It can also raise the risk for infection.
What is Sickle Cell Anemia