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MariettaO [177]
3 years ago
15

If a DNA molecule is compared to a spiral staircase, what parts make up the steps?

Biology
2 answers:
RUDIKE [14]3 years ago
5 0

pairs of nitrogen bases

MrRissso [65]3 years ago
3 0
I like to think of the DNA molecule strand as a ladder, rather than a spiral staircase. The siderail of the DNA ladder (The DNA "Backbone") consists of the Sugar and Phosphate molecules. The rungs of the ladder (the inner bases) consist of the pairs of Nitrogen Bases - Adenine, Guanine, Cytosine and Thymine. 

hope this helped :)
alisa202
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Answer:

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Explanation:

Given,

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When F1 progeny is test crossed with white coat and pink eyes hamster:

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brown, pink eyes = 99 = parental

white, green eyes = 103 = parental

brown, green eyes = 12 = recombinant

white, pink eyes = 11 = recombinant

Recombination frequency =

(total number of recombinants / total progeny ) * 100

= [( 11 + 12 ) / ( 99 + 103 + 12 + 11 )] * 100 = (23/225)*100 = 0.102 * 100 = 10.2 %

1 % recombination frequency = 1 cM distance between genes

Hence, the distance between B and G gene is 10.2 cM

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