Determine the sequence of genes along a chromosome based on the following recombination frequencies:A-B-8 map units A-C-28 map units A-D - 25 map units B-C 20 map units B-D-33 map units


Answer 1


C B A D.


The recombinants can be produced by the crossing during the meiosis. The sequence of the genes can be known by the distance of the recombination frequencies.

The gene sequence problem can be solved by selecting the largest map distance and then placing the genes involved at the opposite ends of the line. This represents the portion of the chromosome. B and D genes must be put farthest as much as possible.  The A and B distance is 8 which we can get by subtracting the A-D and B-D distance.

Thus, the answer is C B A D.

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If a cell of an organism contains a nucleus, the organism is a


Eukaryota i think this is the right answer
It is a Eukaryote. The reason is that Eukarya have Nuclei, while Prokaryotes do not have Nuclei, or organelles. Eukarya do have organelles, which includes Nuclei.

answer: it is a eukaryote

Explain how to focus a microscope using the high-power lens. Include any safety issues you need to be aware of.


1)magnification goes by 10x (read 10 times), 100x,1000x and some goes 10,000x 

2)Always focus first using lowest power possible first, switch to medium power (100x) after it's focused on low power(10x), on 100x, use the small knob to focus it more. DO NOT touch the bigger nob when in medium or high power. Switch to high power (100x) when it is focused on medium power, again focus again using the small knob on high power. 

3) So it doesn't gather dust and fog up the lense? that one should be self explanatory

A ______________ is a prediction of an outcome and the basis for experimentation. A) conclusion
B) constant
C) hypothesis
D) variable


The answer is C) Hypothesis


hope this helps :)


Compare and contrast the specific functions of hydrogen bonds in DNA molecules, and the hydrogen bonds in H2O molecules. I'm not exactly the best at comparing and contrasting, especially in biology.



A hydrogen bond is a weak bond formed by the electrostatic attraction that takes place between proton of one molecule and an electronegative atom of another molecule. It can be of two types intra-molecular and inter-molecular.

In water, hydrogen bonds give characteristic properties such as cohesion, high specific heat, high heat of vaporization, a lower density of ice, and solubility.

In DNA, the hydrogen bonds only provide stability to the overall molecule. The two strands of the DNA stay together or remain attached with the help of hydrogen bonds.

The nucleotide base pairs are joined together through hydrogen bonding. The adenine and thymine are joined together with the help of two hydrogen bonds. The cytosine and guanine are joined together with the help of three hydrogen bonds.

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