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BIOL 1201 Licata Exam 4 Questions and Answers 100% Pass

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  • Course
  • LSU Biol 1201
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  • LSU Biol 1201

BIOL 1201 Licata Exam 4 Questions and Answers 100% Pass What organism did Thomas Hunt Morgan study? why? - ANSWER -fruit flies, because they generated offspring quickly and abundantly, with distinguishable phentotypes What is Thomas Hunt Morgan known for discovering? - ANSWER -Genes are stored ...

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  • December 17, 2024
  • 12
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • LSU Biol 1201
  • LSU Biol 1201
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EmilyCharlene
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BIOL 1201 Licata Exam 4 Questions
and Answers 100% Pass

What organism did Thomas Hunt Morgan study? why? - ANSWER ✔✔-fruit flies, because they

generated offspring quickly and abundantly, with distinguishable phentotypes


What is Thomas Hunt Morgan known for discovering? - ANSWER ✔✔-Genes are stored on specific

chromosomes, sex chromosomes, and crossing-over


How many alleles does a male have for an X-linked trait? - ANSWER ✔✔-One


What are the four systems of sex chromosomes? - ANSWER ✔✔-XX and XY- humans and most animals


XX and X


ZW and ZZ


Haploid and Diploid- lots of insects


What is X-inactivation? - ANSWER ✔✔-X inactivation is when the X chromosome compacts into a Barr

body and genes within become unexpressed. The Barr body lies along the nuclear envelope, and is more

likely in females.


What phenotypical pattern occurs when there are random changes in genetics in somatic such as barr

bodies? - ANSWER ✔✔-Mosaicism


If genes are on the same chromosome what cannot be produced? - ANSWER ✔✔-heterozygous gametes


When does crossing over occur? - ANSWER ✔✔-Meiosis I




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What is the recombination frequency? - ANSWER ✔✔-the percentage of recombinants/ the distance

between 2 genes (higher percentage, more recomination)


what is the unit for recombination frequency? - ANSWER ✔✔-Centimorgan


When do chromosomal abnormalities typically occur? - ANSWER ✔✔-Meiosis I


What is nondisjunction? - ANSWER ✔✔-An error in cell division that causes homologous chromosomes

or sister chromatids to move to the same side of the dividing cell


What is an aneuploidy? - ANSWER ✔✔-Abnormal number of chromosomes.


What is polyploidy? - ANSWER ✔✔-extra sets of chromosomes


What is one common aneuploidy? - ANSWER ✔✔-Down syndrome, trisomy on chromosome 21


What are possible sex chromosome aneuploidys? - ANSWER ✔✔-XXY, XYY, XXX, XO (turner syndrome)


What is a deletion mutation? - ANSWER ✔✔-When one or more nucleotides are lost (i.e., deleted)


What is a duplication mutation? - ANSWER ✔✔-a segment of a chromosome is repeated


Which mutation is most likely harmful? - ANSWER ✔✔-deletion


What is inversion mutation? - ANSWER ✔✔-When a part of the chromosome reverses direction


What is a translocation mutation? - ANSWER ✔✔-moves a segment from one chromosome to another,

nonhomologous one


what happens when translocation is bad? - ANSWER ✔✔-The zygote will not grow


What are the exceptions to mendelian genetics? - ANSWER ✔✔-genetic imprinting, organellar

inheritance, and epigenetics




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