All Questions
130
questions
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83
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Can phenotype change without change in genotype?
If a person with lighter skin is to live in areas close to the equator for a long amount of time, their skin would get darker, and hence their phenotype gets 'altered'.
If I'm to look at their gene ...
- 13
6
votes
1
answer
106
views
Probability of an $AABbCC$ offspring given the cross $AaBbCc\times AaBbCc$, is my solution correct?
So I have been working through the drills in the 26th edition of AP Biology Prep by The Princeton Review for fun when I came across this question in the Chapter 12 drill that I'm not really sure about ...
- 165
0
votes
2
answers
155
views
What really is an allele?
My textbook says:
genes which code for a pair of contrasting traits are known as alleles.
Then that means T and t are alleles. Further, it says:
Mendel also proposed that in a true breeding, tall ...
- 1
0
votes
0
answers
78
views
Genetics question on recombination frequency
A space probe discovers a planet inhabited by creatures that reproduce with
the same hereditary patterns seen in humans. The phenotypic characters are
height (T=tall, t=dwarf), head antennae (A-...
2
votes
0
answers
65
views
Inferring mother's allele probability based on father and children
I am currently in the process of analyzing our family's genome. I do have access to his, mine and our father's genome, but not to our mother's (deceased). I was wondering how I could combine our 3 ...
0
votes
1
answer
70
views
Herbicide resistant crop plants
Consider the above multiple choice question. I can't seem to understand why the answer is B. How does genetically modifying the crop plant have any effect on the weeds?
The way I understand genetic ...
1
vote
1
answer
69
views
Albino pedigree question
https://www.proprofs.com/quiz-school/playquiz/?title=pedigrees-quiz is a link to the website containing this question.
- 11
2
votes
1
answer
102
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Gametes produced after single and double cross overs
A female genotype, shown as abc / +++ produces 100 meiotic
tetrads. Among these, 68 showed no cross over (NCO) events; 20 showed
single crossover (SCO1) between a and b; 10 showed single crossover
...
3
votes
2
answers
119
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Question about using Mendelian inheritance to reverse-guess the parent genotype
I would like some help with a question about Mendelian inheritance, based on the following information (I assume this is autosomal and not sex linked):
-- Start of information --
"As flatfish (...
1
vote
0
answers
177
views
How can I confirm that this pedigree is of a pseudodominant trait?
This is an example of an autosomal recessive trait masquerading as autosomal dominant. I carried out genetic analysis for each generation as if the trait was either recessive or dominant, and both ...
- 11
2
votes
1
answer
106
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Question about manifestation of an X linked disease (homework help)
I am doing some practice exams and came across this question. Perhaps the answer is a lot simpler than my reasoning, but after discussing it with others, I still disagree why the answer is clearly and ...
1
vote
1
answer
88
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Are restriction sites added on to the ends of a DNA fragment or are they just conveniently there?
For a DNA fragment to be inserted, it must have two restriction sites on either end. My textbook makes it seem that this is naturally occurring but it seems a little too convenient, are they added in ...
2
votes
1
answer
191
views
Number of homozygous recessive offspring
A question from the KVPY-SX examination, organised by the Indian Institute of Science (IISc) in Bengaluru, India, held on 3rd November, 2019.
A plant heterozygous for height and flower colour (TtRr) ...
- 326
0
votes
2
answers
421
views
How can we know which alleles are together on a chromosome?
This illustration says that if the two homozygotes pr+ pr+ vg+ vg+ and pr pr vg vg are crossed to produce a heterozygous offspring (pr+ pr vg+ vg), then:
this cross gives us exactly what we need to ...
- 315
0
votes
1
answer
330
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What is the map unit between the genes?
While doing some biology I came across this question:
The following tables present results of plant crosses involving two linked genes: S is a seed-color gene, and L is a plant-height gene. Each gene ...
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