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The R and S loci are 35 m.u. apart. If a plant of genotype
r s
R S
is selfed, what progeny
what proportions?
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- . A plant of genotypea bA Bis testcrossed witha ba bIf the two loci are 10 m.u. apart, what proportion of progenywill be AB/ab?5 & :56M ******* 24 DIHYBRID CROSSES DRV 0 Stv T alı A @ zladenA 9160p2-id2 bns obidalbaneoviene da II\ MOD YR 21 $59A ... Create a dihybrid cross and determine the expected phenotypic percentages of the offspring of two corn plants both of which are heterozygous for colour and texture (RrTt X RrTt). Don't forget to include clear let statements, and follow the all six steps taught on solving genetics problems. insig moni nellog: bna. zoom11:52 and ry bod es loc he al alle omi Tomo tted es, wh Show cemplete nis ne n the type ratios for each generatio pes an Other problems: How do you know the genotype of organisms with a dominant phenotype? Is it homozygous or heterozygous? 8. A pea plant exhibits a purple color, but you are unsure of its genotype. With what could you cross this plant to determine its genotype? Show all of your work for the cross. What is this type of cross called? Incomplete dominance: Genes code for the production of specific proteins, many of which are enzymes. Different alleles at a locus code for alternative forms of a protein that differ in structure and when the protein is an enzyme, often have different degrees of catalytic activity. Therefore, a heterozygote genotvpe produces an intermediate phenotype.
- . The two loci P and Bz are normally 36 m.u. apart on thesame arm of a certain plant chromosome. A paracentricinversion spans about one-fourth of this region butdoes not include either of the loci. What approximaterecombinant frequency between P and Bz would youpredict in plants that area. heterozygous for the paracentric inversion?b. homozygous for the paracentric inversion?A pure-breeding strain of squash that produced diskshaped fruits (see the accompanying illustration) wascrossed with a pure-breeding strain having long fruits.The F1 had disk fruits, but the F2 showed a new phenotype, sphere, and was composed of the followingproportions:Longlong 32 sphere 178 disk 270Sphere DiskPropose an explanation for these results, and showthe genotypes of the P, F1, and F2 generations.F1 hybrids between two species of cotton, Gossypium barbadenseand Gossypium hirsutum, are very vigorous plants. However, F1crosses produce many seeds that do not germinate and a high percentageof very weak F2 offspring. Suggest two reasons for theseobservations.
- A strain of plants has a mean height of 24 cm. A second strain ofthe same species from a different geographical region also has a mean height of 24 cm. When plants from the two strains arecrossed together, the F1 plants are the same height as the parentplants. However, the F2 generation shows a wide range ofheights; the majority are like the P1 and F1 plants, but approximately4 of 1000 are only 12 cm high, and about 4 of 1000 are36 cm high. Question: What mode of inheritance is occurring here?CH 1-4 X с Maya S x Credib x app.wizer.me/learn/00E0AB wizer.me a Maya X A To-do 25% The table gives the genoty Assign x M Dashb x 50% Figurat X C In cows, brown (B) is codominant with white (W). The heterozygous phenotype is brown and white speckles. A farmer decided to cross a brown cow and a white cow in hopes of making all brown and white speckles. What percentage of the offspring will be brown with white speckles? Figurat X 75% Dashboard Incomp X d Interac X Enter class code Go 100%3.5 25 An individual of genotype AA Bb Cc DD Ee is test- crossed. Assuming that the loci undergo indepen- mETg dent assortment, what fraction of the progeny are expected to have the genotype Aa Bb Cc Dd Ee? oldizz0g S 16 J60 016 160
- Red-flowering snapdragons are homozygous for allele RI. White-flowing snapdragons are homozygous for a different allele (R2). Heterozygous plants (R1 R2) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype? a. R1R1 R1R2 b. R1R1 R2R2 c. R1R2 R1R2 d. R1R2 R2R2dd-ons Help в I U A Calibri 12 三 三1 |:三 6. Consider a guinea pig with a homozygous genotype and a white fur color phenotype. a. What is the probability this parent will produce a gamete with the dominant allele? b. What is the probability this parent will produce a gamete with the recessive allele? C. If 31 sperm cells are collected from this guinea pig, how many would you expect to have the recessive allele (as determined by sequencing the gene)? !!!non OBYTOT SEI deutet bos nuol 3. Based on the total number of kernels of corn you counted, calculate the expected number for each phenotype if the parents of this corn were both RrTt. Show how you calculate these numbers below and en transfer them to the observation table (155 Kernels) then INO 4 4. Using chi-square analysis to compare the actual phenotype and expected phenotype numbers determine if you can statistically accept that both parents have the genotype RrTt. Your chi square data will be recorded to helow. nb number) which allows for