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erma4kov [3.2K]
3 years ago
8

What helps maintain global oxygen concentrations in the troposphere?

Biology
1 answer:
olya-2409 [2.1K]3 years ago
6 0
It was plants maintained photothenysis . global oxygen increase very important.but natural do it
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How does a ring species illustrate speciation in action?
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Answer:

Speciation occurs at terminal population groups

Explanation:

A ring species represents a group of organism that has moved beyond a geographic barrier to produce a ring shaped distribution. This population is contiguous and there exists no barrier to gene flow anywhere in the ring except at the terminal populations.  

Speciation is demonstrated in the terminal population has become sympatric and it does not interbreed even if they are connected by chain of intergrading or interbreeding populations

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Henry went on a field trip to a national park. He not only observed the aquatic life in the pond, but also the trees, vegetation
Tomtit [17]

Henry observed the aquatic life in the pond, but also the trees, vegetation, and animal’s species on land. The diversity observed by henry is ecological diversity. Ecological diversity is the variation in the ecosystems found in a region or the variation in ecosystems over the whole planet. Ecological diversity includes the variation in both terrestrial and aquatic ecosystems.

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Fats are specialized lipid molecules, and enzymes are specialized protein molecules. How do the functions of fats and enzymes di
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6 0
3 years ago
(Here's the table used for context)
Bingel [31]

In complete dominance, heter0zyg0us individuals carry both alleles -dominant and recessive- but only express the dominant phentoype. Cross 1: Nn x nn. Cross 2: NN x nn

<h3>What is complete dominance?</h3>

When the dominant allele completely masks the recessive allele, we talk about complete dominance.

This is the case of individuals that are heter0zyg0us for a particular gene and express the dominant trait. The dominant allele is hiding the expression of the recessive allele.

<h3>What is a punnett square?</h3>

The Punnett square is a representation that shows the different types of <u>gamete combinations </u>according to the alleles involved in a cross.

Punnett square shows the <u>probabilities</u> of getting offspring with different <u>genotypes</u> and their consequent<u> </u><u>phenotypes.</u>

So, according to the provided data,

  • <u>Cross 1</u>: gray fur x black fur

F1) 3 gray fur: 2 black fur

  • Cross 2: gray fur x black fur

F1) 0 gray fur: 5 black fur

By looking at the phenotype of progeny produced by family 2, and assuming complete dominance, we can infere that black is the dominant phenotype. Why is that? because when you crossed a gray animal with a black animal and the whole progeny is black.

So, assuming a diallelic gene coding for the fur color, we will name

  • N to the dominant allele that codes for black
  • n to the recessive allele that codes for gray.

Possible genotypes and phenotypes

  • NN ⇒ Black fur  ⇒ dominant phentoype
  • Nn ⇒ Black fur ⇒ dominant phentoype
  • nn ⇒ Grey fur ⇒ recessive phentoype

Here what you need to analyze is which phentoypes appear among the progeny and their frequencies to get to interprete the parents' genotype.

  • If both parents are h0m0zyg0us dominant (NN x NN), the whole progeny expresses the dominant trait (100% NN)

  • If one parent is h0m0zyg0us dominant and the other one heter0zyg0us (NN x Nn), the whole progeny expresses the dominant trait (50%NN and 50%Nn).

  • If one parent is h0m0zyg0us dominant and the other one h0m0zyg0us recessive (NN x nn), the whole progeny expresses the dominant trait (100% Nn).

  • If both parents are heter0zyg0us (Nn x Nn), the offspring will express both phenotypes in a ratio 3:1 (25% NN + 50% Nn and 25% nn).

  • If one parent is h0m0zyg0us recessive and the other one heter0zyg0us (nn x Nn),  the offspring will express both phenotypes in a ratio 1:1 (50% Nn and 50% nn).

  • If both parents are h0m0zyg0us recessive (nn x nn), the whole progeny will express the recessive trait (100% nn).

Now let us analyze the crosses,

  • <u>Cross 1</u>: gray fur x black fur

F1) 3 gray fur: 2 black fur

You crossed a black animal with a gray animal and the offspring expresses both phenotypes. So the black animal (dominant phenotype) must be heter0zyg0us for coat color.

Parents' phenotype)  gray   and    black

Parentals)                      nn     x     Nn

Alleles in Gametes)   n      n       N      n        

Punnett square)           N          n

                            n       Nn       nn

                            n       Nn       nn

F1) Genotype

1/2 = 50% of the progeny is expected to be heter0zyg0us, Nn

1/2 = 50% of the progeny is expected to be h0m0zyg0us recessive nn

      Phenotype

1/2 = 50% of the progeny is expected to be black -Nn-

1/2 = 50% of the progeny is expected to be gray -nn-

  • Cross 2: gray fur x black fur

F1) 0 gray fur: 5 black fur

You crossed a black animal with a gray animal and the offspring expresses only the dominant phenotypes. So the black animal must be h0m0zyg0us dominant for coat color.

Parents' phenotype)  gray   and    black

Parentals)                      nn     x     NN

Alleles in Gametes)   n      n       N      N        

Punnett square)           N         N

                            n       Nn        Nn

                            n       Nn        Nn

F1) Genotype

100% of the progeny is expected to be heter0zyg0us, Nn

      Phenotype

100% of the progeny is expected to be black -Nn-

Remember that the Punnett square does not give you information about the number of individuals that can be produced. It just provide information about probabilities of getting individuals with certain genotype of phenotype and their frequencies.

You can learn more about complete dominance and punnett square at

brainly.com/question/1953851

brainly.com/question/25357981

#SPJ1  

5 0
2 years ago
Carrying the genetic code and determine an organisms structure and function are the functions of ?
ziro4ka [17]
DNA carries the genetic code and determine an organisms structure and functions.
5 0
3 years ago
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