Pedigree WS
For the following questions, write the GENEOTYPES OF THE PARENTS ONLY. DO NOT DO THE PUNNETT SQUARE!
1) A homozygous black rat is crossed with a homozygous white rat (black is recessive).
2) A homozygous brown mouse is crossed with a heterozygous brown mouse (tan is recessive).
3) Two heterozygous white rabbits are crossed.
4) A heterozygous white rabbit is crossed with a homozygous black rabbit.
For the following, complete the punnett square and give the genotype and phenotype PERCENTAGES.
5) A homozygous brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color).
Genotype=
Phenotype=
6) Two heterozygous blackrabbits are crossed. Brown fur is recessive.
Genotype=
Phenotype=
7) A heterozygous grey rabbit is crossed with a homozygous black rabbit.
Genotype=
Phenotype=
Complete a punnett square, list the percentages of each genotypes and each phenotype.
1. A homozygous red flower is crossed with a homozygous white flower. Red and white show incomplete dominance.
Genotype=
Phenotype=
2. A heterozygous medium height plant is crossed with a homozygous tall plant. Tall and short show incomplete dominance.
Genotype=
Phenotype=
3. Two heterozygous grey bunnies are crossed. Black and white fur show incomplete dominance.
Genotype=
Phenotype=
4. A homozygous red-coated dog is crossed with a homozygous white-coated dog. Red and white coats are codominant.
Genotype=
Phenotype=
5. Two heterozygous black and white spotted T-rexes are crossed. Black and white arecodominant.
Genotype=
Phenotype=
6. A heterozygous black and red dragon is crossed with a homozygous red dragon. Red and black are codominant.
Genotype=
Phenotype=
7. A nurse at a hospital removed the wrist tags of three babies in the maternity ward. She needs to figure out which baby belongs to which parents, so she checks their blood types. Using the chart below, match the baby to its correct parents. Show the crosses to prove your choices.
Parents / Blood Types / Baby / Blood typeMr. Hartzel / O
Mrs. Hartzel / A / Jennifer / O
Mr. Simon / AB / Rebecca / A
Mrs. Simon / AB / Holly / B
Mr. Peach / O
Mrs. Peach / O
Hemophilia is a sex-linked trait found on the X chromosome. To get this disease, a person must have a recessive copy of the gene (h) on every X chromosome. Predict the genotypic and phenotypic percentages of the offspring if a woman who was a carrier for the disease had a baby with a man who had the disease.
Genotype of Mother: ______Genotype of Father:______
Genotype=
Phenotype=
Baldness is also a sex-linked trait found on the X chromosome. To become bald, a person must have a recessive copy of the gene (b) on every X chromosome. Predict the genotypic and phenotypic probabilities of the offspring if a woman who has no history of baldness in her family (B) had a baby with a man who was bald.
Genotype of Mother: ______Genotype of Father:______
Genotype=
Phenotype=
A woman who is colorblind (XcXc) can expect —
A 100% of her female offspring to be colorblind.
B 100% of her male offspring to be colorblind.
C 50% of her female offspring to be colorblind.
D 50% of her male offspring to be colorblind.
In people, the trait for colorblindness (Xb) is a recessive sex linked trait and normal vision (XB) is dominant. If a female who is heterozygous for colorblindness has children with a man who has normal vision, what percent of their male children would be expected to be color blind?
A 0%
B 25%
C 50%
D 100%
Imagine that the dark shapes are individual with a recessive disease.
1. Using the letter r, what would the genotype of someone with the disease have to be?
On the diagram above, label all of the dark shapes with that genotype.
2. Using the letter R, what are the two genotypes someone with a white shape could have?
3. Label the genotypes of individuals I1 ,II2 and II3. Remember that if someone has the disease, they had to get a recessive gene from both parents and that a parent with the disease has to pass on the recessive gene.
1. If you look at the offspring of the second line, you will notice that one of their kids is black. You can use this to tell if black is dominant or recessive. Using R/r, what is the genotype of black shapes?
Label all of the black shapes in the diagram.
2. Now go back and label the genotypes of the parents in the second line.
3. Look at the middle parents in the third line and label their genotypes. How do you know their genotypes? Explain in two sentences below.
On the question below, make sure you look for parents of the same color that produce a child that is an opposite color and label that child as being recessive before answering the question.
Pedigree WS