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- C B 2089202222 a b d B А. a e The figure above shows images of five different cells. Each box contains an image that represents a cell of an AaBb dihybrid that is in some stage of meiosis or mitosis. The lines represent chromatids. The letters on the lines represent alleles. The shaded region shows the shape of the cell. Refer to this figure as you consider the questions below. Each box contains an image that represents a cell of an AaBb dihybrid that is in some stage of meiosis or mitosis. The lines represent chromatids. The letters on the lines represent alleles. The shaded region shows the shape of the cell. Refer to this figure as you consider the questions below. Each box represents a cell in meiosis or mitosis. The lines represent chromatids. The letters next to the lines represent alleles. The shaded region shows the shape of the cell. The A gene controls an X-linked trait. The B gene controls an autosomal trait. Refer to this figure as you consider questions X-Y below + 8)…7.7 Genes a and b are 20 cM apart. An a* b*la* b* individual was mated with an a bla b individual. (a) Diagram the cross and show the gametes produced by each parent and the genotype of the F₁. (b) What gametes can the F, produce, and in what proportions? (c) If the F, was crossed to a bla b individuals, what off- spring would be expected, and in what proportions? (d) Is this an example of the coupling or repulsion link- age phase? (e) If the F, were intercrossed, what offspring would be expected, and in what proportions?3.11 The accompanying gel diagram shows the banding patterns observed among the progeny of a crossS between double heterozygous genotypes shown at the left (P1 and P2). On the right are shown the pat- emoterns of bands observed among the progeny. The P60r bands are numbered 1-4.
- An individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R ST • U D E F R ST • U V W X Q. Explain why the fertility of this individual is likely to be less than the fertility of an individual without a translocation.Figure 7.2 If a mutation occurs so that a fungus is no longer able to produce a minus mating type, will it still be able to reproduce? Figure 7.2 (a) In animals, sexually reproducing adults form haploid gametes from diploid germ cells. (b) Fungi, such as black bread mold (Rhizopus nigricans), have haploid-dominant life cycles. (c) Plants have a life cycle that alternates between a multicellular haploid organism and a multicellular diploid organism. (credit c fern: modification of work by Cory Zanker; credit c gametophyte: modification of work by Vlmastra/Wikimedia Commons)6.11 Arabidopsis thaliana is the most widely used flowering plant for genetic and genomic studies. The graph in Figure Q6.2 shows the DNA content per cell at different times points during the life cycle of the plant, beginning with somatic cells of the flower and ending with the single cell seed (after fertilization). Indicate where the stages of premeiosis, meiosis, and fertilization would be found on the X-axis. 0.8 DNA content per cell (pg) 0.4 0.2 Time Figure Q6.2
- 1. 10 Meiosis Reading and Voc X James Green- Recovery Opportu X d/e/1FAlpQLSe2TqFrpPuk-re3-isqbyWK6SUIH3pkHhJdbT0tlqogh58bww/viewform?hr_submission=Chkis-WD4ZSE What is the process by which haploid gametes combine, forming a diploid 3p cell with 2n chromosomes, with n chromosomes from the female parent and n chromosomes from the male parent? Topography O Fertilization Genomics Crossing over 2 points nit that controls inherited trait expression that is passed II3.23 The following pedigree shows the inheritance of a reces- sive trait. Unless there is evidence to the contrary, assume that the individuals who have married into the family do not carry the recessive allele. What is the chance that the offspring of the following matings will show the trait: (a) III-1 × III-12; (b) II-4 × III-14; (c) III-6 × III-13; (d) IV-1 X IV-2? I || III 2 2 3 4 LO 5 3 6 7 8 1 1 2 9 10 2 5 6 7 8 11 12 13 14 15 16 17Assume that the diploid number of a certain species is four chromosomes, two large and two small (2n=4). a) Of the following figures, which represents a 3n (triploid) cell in mitotic metaphase? b) For each of the wrong answers from part (a) above, explain briefly why it cannot represent a triploid cell in mitotic metaphase.
- (Problem 65a) In the plant Arabidopsis, the loci for pod length (L, long; I, short) and fruit hairs (H, hairy; h, smooth) are linked 16 m.u. apart on the same chromosome. The following crosses were made: (i) L H/L H × 1 h/l h F1 (ii) L h/L h × 1 H/I H F1 If the F1's from cross i and cross ii are crossed, what proportion of the progeny are expected to be I h/l h? Oa. 16.00% Оb. 8.00% Oc. 4.00% Od. 3.36% Oe. 1.28%3.9 How many different kinds of F, gametes, F, genotypes, and F, phenotypes would be expected from the following crosses: (а) АА Х аа; (b) АА ВВ Х aa b; (c) АA ВВ СС Х аа bb cc? (d) What general formulas are suggested by these answers? ANS: F, Gametes F, Genotypes F, Phenotypes (a) 2 2 (b) 2 × 2 = 4 3 X 3 = 9 2 X 2 = 4 (c) 2 × 2 × 2 = 8 3 × 3 × 3 = 27 2 × 2 × 2 = 8 2", where n is the number of genes (d) 2" 3" 3.Why is 26 incorrect