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Alborosie
3 years ago
8

28) When administering chest compression to someone whose heart has stopped beating, the heel of the hand should be placed on th

e sternum on a line drawn between the nipples. Why would it be a problem if the hand was placed at a lower part of the sternum?
Biology
1 answer:
KiRa [710]3 years ago
3 0

Answer:

The sternum may suffer a fracture

Explanation:

The sternum is not all solid bone, it has a section of cartilage at the tip as it approaches the abdomen. Therefore it is easy for it to be fractured if pressure is exerted below the line marked by the two nipples, which is a place where it is strong enough to be safely pressed by the heel of the hand.

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An AAbb strain is crossed to an aaBB strain and the resulting progeny self-crossed. If A andB are located 10 cM apart from each
skelet666 [1.2K]

Answer:

20.3%

Explanation:

Given that:

An AAbb strain is crossed to an aaBB strain

i.e.

                   AAbb      ×      aaBB

gametes       Ab                   aB

For F₁

generation;  

If the resulting progeny are now self-crossed.

We know that the genetic distance between these two genes on the same chromosome is said to be 10 cM.

i.e. the recombinant gene = 10%; Hence, the parental gene will be (100 - 10)% = 90%

Ab ×   aB  =   Aa    AB      ab     Bb

From above; the parental gene;

Ab and   aB = 90% with each being 45%

i.e. Ab = 45%   and aB = 45%

while the recombinants genes are:

AB and ab = 10%

i.e. AB = 5%  and ab = 5%

Finally; the percentage of aaBB is = aB% ×  aB% × 100%

the percentage of aaBB is = 0.45 × 0.45 × 100%

the percentage of aaBB is = 20.25%  ≅ 20.3%

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hope this helps
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3 years ago
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