Question

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

The sequence of genes along a chromosome based on recombination frequencies is A-B-C-D.

Step-by-step explanation:

The sequence of genes along a chromosome can be determined based on the recombination frequencies. In this case, the recombination frequencies are as follows:

• 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

To determine the gene sequence, we can start by finding the gene pair with the lowest recombination frequency. In this case, A-B has the lowest recombination frequency of 8 map units. This means that genes A and B are closest to each other on the chromosome and are likely to be inherited together. Next, we compare the recombination frequencies of A-D (25 map units) and B-C (20 map units).

Since B-C has a lower recombination frequency, we can conclude that genes B and C are next to each other on the chromosome. Finally, we compare the recombination frequencies of A-D (25 map units) and B-D (33 map units). Since A-D has a lower recombination frequency, we can conclude that genes A and D are furthest apart on the chromosome. Therefore, the correct sequence of genes along the chromosome is A-B-C-D.

Answer 2

Answer: The correct answer is :

B --- 33 ---- D

/ \

C ----- 20 ------ B-8 ---- A ---- 25 ----- D

I

C ----- 28 ------ A

Step-by-step explanation: Link maps: Recombination frequencies can be used to map the relative location of genes on a chromosome. 1 map unit%. Father apart genes are, the higher the probability that a cross over will occur.