Genetics Answers

List several characteristics that eubacteria and archaea have in common and that distinguish them from eukaryotes. 

How are antibiotic-resistance cassettes acquired by integrons? Once acquired, can they be lost?

• When an Hfr bacterial cell transfers its chromo- somal DNA into an F2 recipient cell, where in the chromosome does the transfer process begin? How long does it take to transfer the entire chro- mosome? Why does complete chromosome trans- fer happen only rarely?
• How does the process of transduction differ from that of transformation?

• How are antibiotic-resistance cassettes acquired by integrons? Once acquired, can they be lost?
• What role do antibiotic-resistance genes, trans- posable elements, and transmissible plasmids play in relation to certain pathogenic bacteria that are simultaneously resistant to multiple, chemically unrelated antibiotics?
• How could you distinguish between a bacterial strain that has the phenotype Lac1 and one that has the phenotype Lac2?
• How could you distinguish a Lac1 Amp-r bacterial strain from one that is Lac2 Amp-s? (Amp-r denotes resistance to the antibiotic ampicillin, and Amp-s denotes sensitivity.)
• How does the physical state of the F factor differ between an F1 bacterial cell and an Hfr bacterial cell?
• Is the F1 state of a bacterial cell infectious? Is the Hfr state infectious? Explain why or why not.

n pea plants green pods are dominate to yellow pods if a green pod plant that had a yellow pea pod parent is crossed with a yellow pea pod plant what percentage of the offspring will have green pea pods?

Draw a punnet square that represents the cross between a homozygous mouse with black fur and a homozygous mouse with white fur

The presence of freckles (F) is dominant to no freckles (f). Jake and his mom have freckles, but his sister and Dad do not have freckles. Complete the Punnett square that shows Jake's family.

Using what you know about dna, what does it mean for there to be a mutation in the cystic fibrosis gene

Consider three yellow, round peas, labeled A, B, and C. Each was grown Into a plant and crossed to a plant grown from a green, wrinkled pea. Exactly 100 peas derived from each cross were sorted into phenotypic classes as follows: A: 51 yellow, round 49 green, round B: 100 yellow, round 24 yellow, round 26 yellow, wrinkled 25 green, round 25 green, wrinkled What are the genotypes of plants A, B, and C?

The Hamster Pet Farm ordered a pair of black haired hamsters for breeding. The first generation were all black hamsters. When the Pet Farm mated hamsters of the first generation, one of the offspring turned out to be white. The Pet Farm said this must have been caused by a "hidden gene." Why did this happen? Explain "hidden gene' and how one of the offspring could have been white in this family of hamsters. Explain how you would keep track of the different generations. How could the owner get pure black hamsters. You must use these words to explain the situation or you lose points. Punnett Square, hybrid, pure, dominant, recessive, predict or chance, and pedigree. This is worth 13 points so it should be a paragraph NOT one sentence.