In hamsters, black hair is dominant over white hair. A male hamster homozygous for 9. black hair (BB) is crossed with a white female hamster (bb). What are the genotypic and phenotypic ratios of their offspring? If they had 8 babies, how to be black? many would you expect
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- A true-breeding rabbit with agouti (mottled, grayish brown) fur crossed with a true-breeding rabbit with chinchilla (silver) fur produces all agouti offspring. A true-breeding chinchilla rabbit crossed with a true-breeding Himalayan rabbit (white fur with pigmented nose, ears, tail, and legs) produces all chinchilla offspring. A true-breeding Himalayan rabbit crossed with a true-breeding albino rabbit produces all Himalayan offspring. Explain the inheritance of the fur colors.1. In pea plants, yellow peas are dominant to green peas and purple flowers are dominant to white flowers. For each of the following parental crosses, give the predicted phenotypic and genotypic ratios of the F1 generation. Make punnet squares if necessary. 1. (heterozygous purple-flowered) x (heterozygous purple-flowered) 2. (true breeding white-flowered, yellow pea) x (true breeding purple-flowered, green pea) 3. (heterozygous purple-flowered, yellow pea) x (heterozygous purple-flowered, yellow pea) 2. You have a purple-flowered pea plant. You do not know its genotype. Diagram the test-cross you would conduct to determine the plant’s genotype and what results you would expect if the plant was heterozygous and if the plant was homozygous 3. You are studying five traits in Pentids, an amazonian flying beetle. You have identified each trait as belonging to separate alleles located on separate chromosomes and have categorized those alleles as A,B,C,D, and E, respectively. After years of…ddTtBbqqAA X ddttBbQqaa:probability of producing an individual that is dominant for B & A and recessive for D, T and Q?
- 1. A red-green colorblind woman marries a man with normal vision. What are the genotypes and phenotypes of the children? Identify the type of inheritance (complete dominance and if so which trait is dominant; or incomplete dominance or codominance/multiple alleles or sex linked, circle one) and define your symbols________________________________________________ a) What is the genotypic ratio of the above cross (Write number next to genotype)? b) What is the phenotypic ratio of the above cross? (Write number next to phenotype)?1. Dihybrid crosses: In dogs, black coat color(B) is dominant to yellow coat fur (b), and straight fur (F) is dominant to curly fur (f). The coat color gene and the fur texture gene are on different chromosomes, so they assort independently, and are not sex linkied. Determine the ratio of having a yellow dog with straight hair if the parents are: BbFF x Bbff a. What are the phenotype of the parents? b. Complete a punnet square. List all the genotypes of the predicted offsprin of this mating c. Based on your Punnet sqaure, list all the genotypes for offspring that would yield a dog with yellow straigh hair d. Based on the punnet square, what is the predicted phenotypic ratio for those parents having a dog with black curly hair.1. A pure breeding dark blue flowered plant is crossed with a pure breeding white flowered plant and all the F1 progeny are dark blue flowered. Identify the type of inheritance (complete dominance and if so which trait is dominant; or incomplete dominance or codominance/multiple alleles or sex linked, circle one) and define your symbols_________________________________________ a) What is the genotype of the F1 generation? _______________________ What is the result of F1 x F1 cross? b) What is the genotypic ratio of the above cross (Write number next to genotype)? ___________________________________________________________________ c) What is the phenotypic ratio of the above cross? (Write number next to phenotype)? ___________________________________________________________________
- The Delacour family is descended from the Veela race, a semi-human, semi-magical humanoid people reminiscent of the Sirens in Greek mythology with special powers. Imagine that being a Veela and having these powers is a X-Linked Dominant trait that is passed on genetically. (Hint: Use the Punnett Square.) What are the possible genotypes for Fleur and Bill’s daughter, Victoire? What are the genotypic frequencies related to the female children (in percentage format)? What is the likelihood (in percentage format) that Victoire would express Veela powers?1. A pure breeding dark blue flowered plant is crossed with a pure breeding white flowered plant and all the F1 progeny are baby blue (light blue) flowered. Identify the type of inheritance (complete dominance and if so which trait is dominant; or incomplete dominance or codominance/multiple alleles or sex linked, circle one) and define your symbols ____________________________________________________________________________ a) What is the genotype of the F1 generation? _______________________ What is the result of F1 x F1 cross? b) What is the genotypic ratio of the above cross (Write number next to genotype)? ___________________________________________________________________ c) What is the phenotypic ratio of the above cross? (Write number next to phenotype)? ___________________________________________________________________Polydactylism (extra digits) is due to a dominant autosomal allele, what is the likelihood that a couple with the normal number of digits have a son with polydactylism? Flower color in snapdragons is due to a gene with incomplete dominance: CRCR plants have red flowers, CRCW have pink flowers, and CWCW plants have white flowers. Which cross is expected to yield progeny that all have pink flowers? A couple is expressing a child, the man has hemophilia (a sex-linked blood disorder due to a recessive allele) and the woman is a carrier for this disorder. If they have a daughter, what is the likelihood that she will inherit hemophilia?
- Individual #9 marries an unaffected individual (not shown). They have four children, two boys, and two girls. How would I use Punnett squares to show the possible gametes that would result from these two parents? Is there a difference in the probability of sons vs. daughters displaying the trait?1. Hereditary deafness in dalmations (d) is a recessive trait. What percentage of the progeny of crossing DD × Dd will be expected to be a carrier of the deafness allele, but not deaf? (enter a number only) 2.In snapdragons, a flowering plant, red (R) flower colour is dominant to white (r). The heterozygous condition results in pink flower colour. If a two pink flowered snapdragons are crossed, what is the resulting phenotype ratio? Select one: a.2:2 b.1:1:1:1 c.1:2:1 d.3:1 e. (all will be the same)ddTtBbqqAA X ddttBbQqaa Based on the cross provided what is the probability of producing an individual that is dominant for B & A and recessive for D, T and Q?
