Which of the following is a correct statement about linkage groups? A. It is a collection...
Which of the following is a correct statement about linkage groups?
A. It is a collection of genes that never produce recombinant gametes.
B. It is a chromosomal region in which crossing over cannot occur.
C. It represents some of the genes located on the same chromosome.
D. It can occur only on an autosome.
Homework Answers
Answer:
C. It represents some of the genes located on the same chromosome.
Explanation:
Morgan and Castle formulated the chromosome theory of linkage. It has the following characters:
- Genes that show linkage are situated in the same chromosome.
- Genes are arranged in a linear fashion in the chromosome. i.e., linkage of genes is linear.
- The distance between linked genes is inversely proportional to the strength of linkage. The genes which are closely located show strong linkage whereas those, which are widely separated, have more chances to get separated by crossing over.
- Linked genes remain in their original combination during course of inheritance.
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1.
2.
13.
Which statement explains why the recombination frequency between two genes is always less than 50%? Recombination cannot be more than 50% because chromosomes are only 50 map units in length. The genotype of the F, gametes will always be 50% parental gametes and 50% recombinant gametes. Genes with a recombination frequency near 50% are unlinked and have an equal likelihood of being inherited together or separately. F1 gametes always have 50% of their alleles from each parental...
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a) What must Biff’s genotype be?
b) For these three genes, draw the arrangement
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on the information given above, you do not know for certain what
order the genes are in along the chromosome, but you do know...
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viable and able to produce progeny but usually in fewer numbers.
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B. Also, explain how would you distinguish among pericentric
inversions, paracentric inverisons, reciprocal translocations and
non reciprocal translocations as sources of semi-sterility. You
need to consider meiotic figures.
C. How can these chromosome aberrations be used to map genes to
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