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3 years ago

Gas exchange takes place in the

Biology

2 answers:

Semmy [17]3 years ago

8 0

Lungs for human and gills for aquatic animals

vesna_86 [32]3 years ago

7 0

Gas exchangeis the delivery of oxygen, so im guessing it takes place in the bloodstream

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Two autosomal genes, J and K, are 60 map units apart. You perform the following testcross: J K / j k x j k / j k. At what freque

Dmitry [639]

Answer:

J K / j k = 20%

j k / j k = 20%

J k / j k = 30%

j K / j k = 30%

Explanation:

To calculate the recombination frequency, we have to know that 1% of recombinations = 1 map unit = 1cm. And that the maximum recombination frequency is always 50%.

The map unit is the distance between the pair of genes for which every 100 meiotic products, one of them results in a recombinant one.

So, en the exposed example:

J and K are autosomal genes

J and K are separated by 60 M.U.

60 M.U. means that there is 60% of recombination.

Cross) J K / j k x j k / j k

Gametes) JK Parental jk, jk, jk, jk

jk Parental

Jk Recombinant

jK Recombinant

One map unit equals 1% of recombination frequency. This means that every 100 meiotic products, one of them is a recombinant one.

1 M.U. -------------- 1% recombination

60 M.U. ------------ 60% recombination

30% Jk + 30% jK

100 M.U. - 60 M.U. = 40 M.U.

40M.U.--------------40 % Parental (Not recombinant)

20% JK + 20% jk

Punnet Square) JK jk Jk jK

jk JK/jk jk/jk Jk/jk jK/jk

J K / j k = 20%

j k / j k = 20%

J k / j k = 30%

j K / j k = 30%

3 0

2 years ago

A manager wanted to test whether the amount of noise in a clothing factory affected how

katrin2010 [14]

Answer:

When seeking to determine the number of shirts made by employees subjected to noise with and without the use of headphones, the dependent variable is the number of shirts made by the employee.

Explanation:

In a study or research, the dependent variable is the result of the intervention on the independent variable, which can be modified. In the case presented, the dependent variable is the quantity of shirts made by the employees, the number of which is measured at the end of the study.

It is expected that those employees who block the noise using headphones produce a greater number of shirts than those exposed totally or partially to noise.

For the other options:

The amount of noise. This can modified by the use or not of headphones and is the independent variable, subject to modification.
The type of music the employees listen to while they work. Does not represent dependent or independent variable.
The amount of training employees need. It is not the variable being studied.

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3 years ago

Which of the following best explains the way that a molecular clock can be used

dimaraw [331]

B!! Because it talks more about the question

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2 years ago

I need help with this question

9966 [12]

Answer:

Genus and species

Explanation:

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2 years ago

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Ugo [173]

Answer:

it is known as the powerhouse of he cell

Explanation:

this is because it extracts energy from food through cellular respiration

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