1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
PIT_PIT [208]
3 years ago
15

True or false? Many environmentalists believe that reducing human population growth could improve environmental issues.

Biology
1 answer:
Lilit [14]3 years ago
3 0
True! Earth is beginning to become very overcrowded and combined with the amount of people of the planet and the carelessness that they all have for it, the earth is slowly beginning to show it's age. Of course, no one will act on this opinion,  because it is quite illegal to just kill people, but it is true!
You might be interested in
In Drosophila, the genes for withered wings (whd), smooth abdomen (sm) and speck body (sp) are located on chromosome 2 and are s
lesya692 [45]

Answer:

A) 47; B) 33; C) 272; D) 122

Explanation:

The three genes are linked.

The female with withered wings and a smooth abdomen has the genotype whd sm sp+/whd sm sp+.

The male with a speck body has the genotype whd+ sm+ sp/whd+ sm+ sp.

Both individuals are homozygous for all genes, so each of them only produces one type of gamete. The resulting F1 therefore has the genotype whd sm sp+/ whd+ sm+ sp, heterozygous for all genes and with a wild-type phenotype.

The females of the F1 were mated with homozygous recessive males (test cross): whd sm sp/whd sm sp.

<h3>A)</h3>

If we assume interference is 0, the probability of crossing over happening between the genes whd and sm is independent from the probability of crossing over happening between sm and sp.

The distance = frequency of recombination × 100, so the frequency of recombination (RF) between genes whd and sm is 0.305 and the RF between genes sm and sp is 0.155.

<u>The expected double crossover progeny among the 1000 offspring will be:</u>

RF whd-sm × RF sm-sp  × 1000 =

0.305  × 0.155 × 1000 = 47 individuals will be double crossover.

<h3>B)</h3>

Interference is 0.3

The interference is calculated as 1- coefficient of coincidence (cc).

cc = observed double crossover/expected double crossover

Therefore:

I = 1 - cc

cc = 1 - I

<u>cc = 0.7</u>

Observed DCO / 47 = 0.7

Observed DCO = 0.7  × 47

Observed DCO ≅ 33

<h3>C)</h3>

The parental gametes are whd sm sp+ and whd+ sm+ sp (the genotype of the F1 female is known).

Looking at them and at the gene map we can tell that the gametes that give rise to withered wings, speck body (whd sm+ sp) and smooth abdomen (whd+ sm sp+) phenotypes are the result of recombination occurring between genes whd and sm.

To calculate the expected number of individuals with those phenotypes among the 1000 progeny we need to determine the frequency of recombination between the genes whd and sm considering there's interference.

The distance whd-sm = RF x 100

The recombination frequency is the sum of the single crossover between whd and sm and the double crossovers.

The frequency of DCO is 33/1000=0.033.

Distance whd-sm/ 100 = SCOwhd-sm + DCO

0.305 - 0.033 = SCO whd-sm

<u>Frequency of SCO whd-sm= 0.272</u>

And the expected number of individuals with those phenotypes will be 0.272 x 1000 = 272.

<h3>D)</h3>

The gametes that originate the phenotypes withered wings, speck body, smooth abdomen (whd sm sp) and wild type (whd+ sm+ sp+) are the result of recombination between genes sm and sp.

Distance sm-sp/ 100 = SCOsm-sp + DCO

0.155 - 0.033 = SCOsm-sp

<u>Frequency of SCO sm-sp= 0.122</u>

And the expected number of individuals with those phenotypes will be 0.122 x 1000 = 122.

6 0
3 years ago
In the summer, snowfall decreases, and melting increases, which results in the outflow being melt.water, thus leading to an incr
JulijaS [17]

Answer:

Negative

Explanation:

5 0
2 years ago
Select the true statement. A) RNA is mostly single-stranded; DNA is always double-stranded. B) RNA and DNA usually have identica
Keith_Richards [23]
A is true, the others are not. I would assume they count the mRNA and tRNA in protein synthesis as 'double stranded'
3 0
3 years ago
Read 2 more answers
Which molecule would be the most affected by limited nitrogen?
stealth61 [152]

Answer:

The molecule that would be affected by 'limited nitrogen' is the myofibrillar proteins in muscle. Explanation: The myofibrils of the muscle have a number of protein molecules.

5 0
2 years ago
Which system is the muscular system anchored to
dybincka [34]

Answer:The bones of the skeletal system serve to protect the body's organs, support the weight of the body, and give the body shape. The muscles of the muscular system attach to these bones, pulling on them to allow for movement of the body.

Explanation:  Hope it helps!

5 0
2 years ago
Read 2 more answers
Other questions:
  • Describe the relationship between group and individual behaviors in animals.
    8·1 answer
  • What accounts for the difference in the functions and properties of molecules like starches, glycogen, cellulose, and chitin?
    7·1 answer
  • What is the main difference between renewable and nonrenewable resources
    11·2 answers
  • Write one similarity and one difference between skeletal muscle and cardiac muscle.
    15·1 answer
  • What are the characteristics of the cell membrane
    11·2 answers
  • What is lactic acid?
    14·2 answers
  • Bermuda grass has _____, or stems that grow along the ground and produce roots, stems, and leaves. 1. stolons 2. tubers 3. rhizo
    11·2 answers
  • during the actual production of proteins in a cell, what might happen to a strand of rna before it leaves the nucleus?
    6·1 answer
  • Insulin and Glucagon are produced in the:______.
    10·1 answer
  • Answer the question below i give brainliest if you answer
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!