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4 years ago

Every cell in your body originated from one cell. What does this mean about the DNA in each of your body cells?

1 answer:

6 0

The DNA is half new because before the cellular division the two DNA strands are separated and then each strand gets a new pair

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How does a lunar month compare to a calendar month?

nadya68 [22]

Answer: D, lunar are 29.5 days, calendar are 28 to 31 days

Explanation: 1. average lunar month lasts 29.530575 days or 29 days, 12 hours, 44 minutes, and 2 seconds, a few days short of a calendar month. The orientation of the illuminated side of the Moon in the Northern Hemisphere. A lunar month is the time it takes the Moon to go through all its phases.

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2 years ago

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What is the original source of energy

xxTIMURxx [149]

Answer:

The Sun is basically the Sun is the original source of energy.

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2 years ago

7. Pyrethrums are chemicals used to kill insects. In bed bugs, the mutant-type allele, r, confers resistance, but only in homozy

natita [175]

Answer:

Allele frequency

Normal allele $= 0.9$

Mutant r allele $= 0.1$

Genotype frequency

Homozygous normal bugs $= 0.81$

Homozygous mutant bug $= 0.01$

Heterozygous normal bug with one mutant r allele and one normal allele $= 0.18$

Explanation:

It is given that 99% of the bugs were killed after the spray of pyrethrum. This suggests that 1% of the bugs that were not killed must be homozygous for the mutant type allele "r"

Thus, the frequency of homozygous "rr" species i.e $q^2 = 0.01$

From this we can evaluate the frequency of mutant "r" allele.

Thus, $q = \sqrt{0.01} \\$

$q = 0.1$

As per Hardy-Weinberg first equilibrium equation, $p + q = 1$

Substituting the value of q in above equation, we get

$p = 1 - q\\p = 1 - 0.1\\p = 0.9$

Thus, the frequency of homozygous normal bug is equal to

$p^2 = 0.9^2 = 0.81$

As per Hardy-Weinberg second equilibrium equation-

$p^2 + q^2 + 2pq = 1\\$

Substituting all the available values we get -

$0.81 + 0.01+ 2pq = 1\\2pq = 0.18$

Allele frequency

Normal allele $= 0.9$

Mutant r allele $= 0.1$

Genotype frequency

Homozygous normal bugs $= 0.81$

Homozygous mutant bug $= 0.01$

Heterozygous normal bug with one mutant r allele and one normal allele $= 0.18$

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3 years ago

Please help, this is a time test and i don’t know the answers.

Vedmedyk [2.9K]

1.E
2.B
3.F
4.A
5.D
6.C
7.G

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3 years ago

How does the geologic time scale further our understanding about the biodiversity on our planet

yarga [219]

Understanding Geologic Time<span>
Introduction</span>

Geologists at the American Museum of Natural History study rock layers and the plant and animal fossils found in them. They use radiometric dating to help establish the age of rocks. In doing so, they also establish the age of the fossils found in rocks. From the evidence they gather, geologists can piece together the physical history of the Earth.

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3 years ago