BIO 121 FINAL EXAM LATEST 2024 ACTUAL
EXAM TEST BANK 300 QUESTIONS AND
CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS ) |ALREADY
GRADED A+
If you start with one nucleus containing 46 chromosomes at the end of one round of mitosis, how many nuclei will there be?How many chromosomes will there be per nucleus? - ANSWER- Two nuclei & 46 chromosomes each
Where are the two chromatids of a chromosome attached to each other? - ANSWER- At the centromere
What are homologous chromosomes? - ANSWER- Chromosomes with the same genes in the same order
In meiosis, when does synapsis occur? - ANSWER- In prophase I
Which of the following is the most common for a human male?XX or XY? - ANSWER- XY
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One nucleus contains 14 chromosomes prior to meiosis. After meiosis is completed, how many nuclei are there and how many chromosomes per nucleus are there? - ANSWER- There are 4 nuclei after complete meiosis and 7 chromosomes per nucleus
Meiosis II is similar to mitosis in that... - ANSWER- Sister chromatids separate during anaphase
Meiosis and fertilization are part of the life cycle of what kinds of organisms? - ANSWER- All sexually reproducing organisms
Two dice are rolled simultaneously; what are the chances that both will show 6? - ANSWER- 1/36
To get this you square the 6
Which process is responsible for the fact that any one chromosome you contribute to a gamete is a mix of chromosomes from your two parents? - ANSWER- The process of crossing over
The individual with genotype AaBbCCDdEE can make many genetically different gametes. What is the major reason for this? 2 / 4
- ANSWER- Different possible arrangements of chromosomes
early in meiosis
An organism that is homozygous for a particular gene has what?
- ANSWER- Has two copies of the same allele of that gene
The allele for red flowers is dominant while the allele for white flowers is recessive. You have a red-flowered plant of unknown genotype. You perform a test cross and about half of the F1 progeny are red and about half are white. What is the genotype of the red-flowered parent? - ANSWER- By crossing Rr x rr you get half Rr and half rr
The answer is Rr
What are the chances of a carrier homozygous recessive and a homozygous not afflicted couple having a baby with cystic fibrosis? - ANSWER- By crossing Cc x CC you get...
CC: 50%
Cc: 50%
indicating that the chance of this couple having a baby with the disease is 0%
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You cross a red-flowered plant and a white-flowered plant, and
all the F1 individuals have pink flowers. You can conclude: -
ANSWER- Incomplete dominance
A man was born with 6 fingers on each hand and 6 toes on each foot. His wife and their daughter have the normal number of digits. Extra digits is a dominant trait. What fraction of this couple's children would be expected to have extra digits? - ANSWER- 50% of their children will be expected to have this trait
In the pedigree on the test, does alkaptonuria appear to be caused by a dominant allele or by a recessive allele, or is there not enough information to determine whether the disorder is recessively or dominantly inherited? - ANSWER- This trait is caused by a recessive allele
Consider the locus that codes for carbohydrates on the surface of red blood cells. What is an example of codominance? -
ANSWER- IAIB
What causes Down Syndrome? - ANSWER- An error during meiosis
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