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The diploid number for fruit flies is 8, and the diploid number for grasshoppers is 46. If no crossing over took place, would thc
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- If you ignore the effect of crossing over, would you expect the genetic information in the secondary oocyte and the first polar body to be identical? Explain your answer completely.arrow_forwardSuppose that the short allele is a meiotic drive gene, and 80% of the gametes from a heterozygous individual with tall and short alleles contain short alleles. If tall is dominant to short, what percent of individuals from a cross between a heterozygous tall individual and a homozygous recessive individual will be tall?arrow_forwardImagine you have two pure-breeding lines of canaries,one with yellow feathers and the other with brownfeathers. In crosses between these two strains, yellowfemale × brown male gives only brown sons anddaughters, while brown female × yellow male givesonly brown sons and yellow daughters. Propose ahypothesis to explain these resultsarrow_forward
- For a certain chromosomal region, the mean number of crossovers at meiosis is calculated to be two per meiosis. In that region, what proportion of meioses are predicted to have (a) no crossovers? (b) one crossover? (c) two crossovers?arrow_forwardTable 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a second sex chromosome. Can Turner syndrome be due to nondisjunction during oogenesis, spermatogenesis, or both? If a phenotypically normal couple has a color-blind child (due to a recessive X-linked allele) with Turner syndrome, did nondisjunction occur duringoogenesis or spermatogenesis in this child’s parents? Explain your answer.arrow_forwardOn average, what proportion of the genome in the following pairs of humans would be exactly the same if no crossing over took place? (For the purposes of this question only, we will ignore the special case of the X and Y sex chromosomes and assume that all genes are located on nonsex chromosomes.) Q. Two full siblings (offspring that have the same two biological parents)arrow_forward
- Assume for a moment that crossing-over did not occur. Would you agree that you received half of your chromosomes from each parent? Would you agree that you received one-quarter of your chromosomes from each grandparent? Would the answer to these questions change if you allowed for crossing-over to have occurred?arrow_forwardFruit flies with one allele for curly wings (Cy) and one allele for normal wings (Cy+) have curly wings. When two curly-winged flies are crossed, 2/3 of the offspring have curly wings and 1/3 have normal wings. If a curly-winged fly is mated to a normal-winged fly, how many flies of each type would you expect among 180 offspring?arrow_forwardIn four-o'-clock plants, the allele for red flowers is incompletely dominant to the allele for white flowers, so heterozygotes have pink flowers. What ratios of flower colors would you expect among the offspring of white flower plants X pink flower plants.arrow_forward
- A cat is born with two X chromosomes and one Y chromosome. One of the X chromosomes carries the black fur allele and the other carries the orange fur allele. Would you expect this cat to be a male or female? Would it be calico?arrow_forwardIn the fruit fly, Drosophila, eye color is a sex-linked recessive trait located on the X chromosome. Red eyes are dominant over white eyes. If a heterozygous female breeds with a white-eyed male, what percentage of the offspring are expected to have red eyes?arrow_forwardChickens with shortened wings and legs are called creepers. When creepers are mated to normal birds, they produce creepers, and normal individuals with equal frequency. When creepers are mated to creepers, they produced three creepers to one normal, (one creeper died). Crosses between normal birds produced normal progeny only. How can these results be explained using C-c notation?arrow_forward
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