Nine-banded armadillos almost always give birth to four offspringthat are genetically identical quadruplets. Explain how you thinkthis happens.
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Nine-banded armadillos almost always give birth to four offspring
that are genetically identical quadruplets. Explain how you think
this happens.
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- Assuming (i) that the two chromosomes in everyhomologous pair carry different alleles of somegenes, and (ii) that no crossing-over takes place, howmany genetically different offspring could any onehuman couple potentially produce? Which of thesetwo assumptions (i or ii) is more realistic?You have a female snail that coils to the right, but you do not knowits genotype. You may assume that right coiling (D) is dominant toleft coiling (d). You also have male snails of known genotype.How would you determine the genotype of this female snail? Inyour answer, describe your expected results depending on whetherthe female is DD, Dd, or dd.Morgan first suggested that theoriginal white-eyed male had two copies of the white-eye allele. Inthis problem, let’s assume that he meant the fly was XwYwinstead ofXw Y What crosses would need to be made to rule out the possibility thatthe Y chromosome carries a copy of the eye color gene?
- A female Komodo dragon (Varanus komodoensis) kept inisolation in a zoo had progeny. Each of the offspring had twoidentical copies of every gene in its genome. However, theoffspring were not identical to one another. Based on yourunderstanding of parthenogenesis and meiosis, propose ahypothesis to explain these observations.A female snail hasoffspring that all coil to the right. What are the possible genotypes ofthis female snail?In a cross of Lymnaea, the snail contributing the eggs was dextralbut of unknown genotype. Both the genotype and the phenotypeof the other snail are unknown. All F1 offspring exhibited dextralcoiling. Ten of the F1 snails were allowed to undergo self-fertilization.One-half produced only dextrally coiled offspring, whereasthe other half produced only sinistrally coiled offspring. Whatwere the genotypes of the original parents?
- In a cross between two varieties of corn, gl1gl1Ws3Ws3(eggparent) x Gl1Gl1ws3ws3 (pollen parent), a triploid offspringwas produced with the genetic constitution Gl1Gl1gl1Ws3ws3ws3.From which parent, egg or pollen, did the 2n gamete originate? Isanother explanation possible? Explain.Why do you think theheterozygote offspring of two Manx catssurvives with developmental abnormalities,whereas the homozygote diesYou are an allele on a single uncondensed chromosome in a Yellowfever-carrying mosquito (Aedes aegypti) diploid cell (2n = 6). Demonstrate in as much detail as possible (1) how you will get to each genetically identical diploid cell of the multicellular offspring; (2) how you will get to the next generation of sexually reproduced progeny. Help, I no understand. Perhaps you will?
- A zookeeper has collected a male and a female lizard that look likethey belong to the same species. They mate with each other andproduce phenotypically normal offspring. However, the offspringare sterile. Suggest one or more explanations for their sterility.On rare occasions, an organism may have three copies of achromosome and therefore has three copies of the genes on thatchromosome (instead of the usual number of two copies). Forsuch a rare organism, the alleles for each gene usually segregateso that a gamete will contain one or two copies of the gene. Let’ssuppose that a rare pea plant has three copies of the chromosomethat carries the height gene. Its genotype is TTt. The plant is alsoheterozygous for the seed color gene, Yy, which is found on adifferent chromosome. With regard to both genes, how manytypes of gametes can this plant make, and in what proportions?(Assume that it is equally likely that a gamete will contain oneor two copies of the height gene.)In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sexreversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this cross.