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prohojiy [21]
3 years ago
11

Rattlesnake fern, or Botrychium virginianum, as shown below, is a species of fern, a seedless plant, that is found all across No

rth America. Which structure is involved in the reproduction of this plant?
A. spores
B. pollen
C.cones
D. fruit
Biology
2 answers:
Lelechka [254]3 years ago
8 0
I think rhe answer is: A. spores
Maurinko [17]3 years ago
7 0
The correct answer should be A. spores

Ferns don't have seeds and they reproduce using spores. Cones have seeds in them and seeds fall out. Pollen enters a flower and then the flower becomes a fruit. This is sexual reproduction of plants. Since ferns don't have this, they have to reproduce with spores.
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Three factors that influence natural selection are?
faltersainse [42]

Answer:

Variation. Organisms (within populations) exhibit individual variation in appearance and behavior. ...

Inheritance. Some traits are consistently passed on from parent to offspring. ...

High rate of population growth. ...

Differential survival and reproduction.

Explanation:

8 0
3 years ago
In humans alkaptonuria is a metabolic disorder in whichaffected persons produce black urine. Alkapotonuria results from anallele
miss Akunina [59]

Answer:

a) The genotype of her father = "aa".

The genotype of her mother = "Aa".

The genotype of Sally is "Aa".  

b) 1/2

c) 1/2

Explanation:

a) Sally's father has alkaptonuria. So, the genotype of her father is "aa". Her mother is normal. Since her brother is affected by the disease, he should be homozygous recessive (aa). This means that the mother also has one copy of "a" allele and is heterozygous dominant (Aa). A cross between Aa (mother) and aa (father) would give 50% affected progeny with "Aa" genotype. So, the genotype of Sally is "Aa".  

b) The genotype of her mother= Aa

The genotype of her father = aa

Aa x aa = 1/2 Aa (affected): 1/2 aa (normal)

So, if Sally's parents have another child, there is a 1/2 probability that this child will have alkaptonuria.  

c) The genotype of Sally = Aa

Genotype of the man Sally marries= aa (since he is affected with alkaptonuria)

Aa x aa= 1/2 Aa (affected): 1/2 aa (normal)

There is a 1/2 probability that their child will have alkaptonuria.

8 0
3 years ago
Chytrids have some unique characteristics that are different from the other groups of fungi. What characteristics make them uniq
xeze [42]

Answer:

Their spores are produced in sac-shaped structures.

Their spores are produced in club-shaped structures.

Their reproductive cells have flagella.

Their reproductive cells have several nuclei.

They live in wet places.

They live in dry places.

Explanation:

The Chytridiomycota, often called chytrids, are unique among all fungi in having motile stages in their life cycles; no other fungi have this trait. These motile stages take the form of zoospores, single cells with a single posterior (at the rear) flagellum.

5 0
3 years ago
Read 2 more answers
What treatment is being compared to the control in the experiment? what treatment is being compared to the control in the experi
stepan [7]

The correct answer is: the treated glioblastoma cells were cultured in the presence of an inhibitor from umbilical cord stem cells, but the control cells were cultured without the inhibitor.

It has been shown that treatment with injected umbilical cord stem cells has strong therapeutic effects on glioma models. Those cells produce anti-tumour substances, with inhibitory effects.

Control group does not include the treatment in order to observe the treatment.


7 0
3 years ago
Which term is used to classify amino acids in the diet?
Elodia [21]
<span>Amino acids are considered as the building blocks of protein's, so amino acid rich food simply means protein rich food. There are 20 classifications for amino acids but nine of them are essential since our body can't make them. Usually in diet important amino acids are Lysine (C6H14N2O2), Leucine (C6H13NO2), Valine (C5H11NO2), Tryptophan (C11H12N2O2), Isoleucine (C6H13NO2) Phenylalanine (C9H11NO2) and Threonine (C4H9NO3).</span>
3 0
3 years ago
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