a) What phenotype are the parental strains? FFss b) What is the phenotype and genotype of the F1's? c) What fraction of the F2's will be: White Black (use fractions!) Gray with white speckles ffSS
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- 4. Albinism is caused bya recessive al lele. A brown rabbit crossed with an albino rabbit produces 12 brown offspring. When the albino rabbit is crossed with a second brown rabbit, 7 brown and 5 albino offspring are produced. What is the best explanation for this genetic situation? Write the genotypes of each of the parents and their offspring. A First set of parents First set of offspring Cenng to ri Second set of parents e 1:s!! A A Second set of offspring Sbl2. Describe the phenotype of the cats with these genotypes (If allele not specified, assume wild type): CC ss OO BB dd McMc tt ww Light brown male with choco [Choose ] Light brown male with chocolate tips ctct ss OY bb TAt A uniformly colored black cat Light grey female with dark grey mackerel stripes Black female with large white patches Dark grey with black mackerel stripes Cc SS Oo BB TATA Cream male with small white patches and orange mackerel stripes CC Ss oY bb dd tt [Choose ]5. The ability to taste PTC paper is controlled by a dominant gene. The ability to taste (T) PTC is 1ueunuop sno8Ázounu ae RIR dominant over the inability to taste (t) PTC. Normal skin (N) is dominant over albino skin (n). Two tasters, normally pigmented, have an albino son and a non-taster daughter. Show the cross between the parents. Genotype of mom Genotype of dad Genotypes Phenotypes What is the chance that the albino son is a taster? What is the chance that the non-taster daughter is an albino? What is the chance that the non-taster daughter is a carrier of the albino trait? What is the chance of getting offspring who are heterozygous for both traits?
- 5. The gene controlling the human ABO blood group system has three alleles that determine the nature of the antigens on the membranes of red cells. Allele lª codes for the production of antigen A on the surface of red blood cells. Allele IB codes for the production of antigen B on the surface of red blood cells. Allele lº does not code for any antigens on the surface of red blood cells. Alleles IA and IB are co-dominant and both alleles are dominant over lº a. Use this information to determine the possible genotypes, antigens and blood group phenotypes within a population. Genotype Antigen(s) Blood Group Phenotype2.In dogs, there is a hereditary deafness caused by a recessive allele, d. A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, but the owner is unsure of the genotype. She does a testcross (crosses it to a homozygous recessive dog), and two of the five offspring are deaf. This means that the male dog A.has the genotype DD B.has the genotype Dd C.is still of unknown genotype since there were offspring of both deaf and hearing phenotypes. D.has the genotype dd7. In humans, the allele for the condition called "hitchhiker's thumb" (h) is thought to be recessive to having a straight thumb (H). Complete the pedigree below to show the probable genotypes. Squares represent males, and circles represent females. Solid shapes show individuals with hitchhiker's thumb. Tetest on O Telw 21 Obe Spagx elift to asqyloneg nembling O N be nick brs O siello frienimob do ebrisasb molaq belexperlo ar emosią yd erl) vd word bna 8 stella tranimob syd ballostno aj otoo belo otin sylace: delslls evideod abud mwond aislą bns ben beoxboro suppysomorneowiad cauro s mengsi bo allueen a bnsa belbsque ont esnammu? en beteaberto S souborg of elem ben nialq s riw batam sismel word bensbero A t sill to sequioneg eldsdong srit evi pnhqalio nword benexperlo bria bas ng s ellene for red.coalcool (
- 10. Horn length in the Sable antelope of Africa involves recessive epistasis. Gene Lcontrols the length of the horns. LLC_ have very long horns, LlC_ have medium sized horns, and llC_ have short horns. Antelope with no horns are always __cc. How would you deduce the genotype of a hornless antelope? cross two hornless antelope together you cannot deduce the genotype with a single breeding experiment cross it with an antelope of genotype llCC. cross it with an antelope of genotype llcc3. In fruit flies, the gene for wing shape has an unusual allele called 'curly (designated cy). The normal(wild type) allele is designated 'cy.' A fly homozygous for cy (cy cy) has normal, straight wings. The heterozygote (Cy cy) has wings which curl up on the ends (and, incidentally, can't really fly). The homozygote for the Cy allele (Cy Cy) never hatches out of the egg. In other words, this allele is lethal in the homozygous condition. If two curly winged flies are mated, and the female lays eggs, predict the following, showing appropriate work: a. How many eggs will produce living offspring? b. How many straight winged flies do you expect among the living offspring? c. What percentage of the living offspring do you expect to be curly winged like the parents? Show your solution.10.You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results? The red allele is dominant to the yellow allele. There is a mutation in the gene for yellow pigment in the "Jealousy" variety. C. There are epistatic interactions between at least two genes for rose pigment. D. There is no recessive allele for the red pigment gene.
- 3. You are studying single gene traits in peas. These are the traits you are following: Gene Symbol Alleles enistic Pairs Appeerance of Hybrid dominant ait) Seed eoler deteric Yellow pea is dominant to green Round pea is dominant to wrinkled Purple flower is dominant to white flowers Unripe pods are dominant to ripe pods Yly R/r Yellow P/p U/u ound Wrinkied Round Flower clor You cross pollen from a pea that is of genotype YyRrPpUu with ovules from a pea whose genotype is YYrrPpUU a. How many different types of gametes can the female produce? Pod color (up) b. How many different types of gametes can the male produce? C. What fraction of the progeny will be phenotypically identical the female parent? d. What fraction of the progeny will be phenotypically identical the male parent? e. What fraction of the progeny will be homozygous at all seven loci? f. What fraction of the progeny will be heterozygous at all seven loci?3. The chestnut coat color of horses is due to a recessive gene, while the dominant allele results in black. The pacing gait is due to a recessive gene, whereas the dominant allele results in the trotting gait. Show the types of offspring that cou result from a cross of a black trotter (male), heterozygous for both genes, with a chestnut pacer (female). ld a. Possible genotypes for Black coat:Chestnut coat: b. Possible genotypes for Trotting gait:Pacing gairi Male possible gametes: Female possible gametes: c. Male genotype d. Female genotype: e. f. Genotypic Ratio: g. Phenotypic Ratio:4. In purple people eaters, one horn (H) is dominant and no horns (h) is recessive. Cross a hybrid purple people eater with a purple people eater with no horns. Genotype: Phenotype: