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Contact [7]
3 years ago
15

Evidence suggests that first, ____________ were acquired when an aerobic bacterium was engulfed by larger cells and became mutua

lly dependent and second, ____________ were acquired by the same means. Because all eukaryotic cells contain organelles, it is obvious that they were aquired before ____________ . Some additional proof of the endosymbiotic theory includes the similarity in size between bacteria and mitochondria and cyanobacteria and chloroplasts. Also, the DNA of mitochondria and chloroplasts is in a circular loop, like those of prokaryotes. Finally, mitochondria and chloroplasts have their own ____________ , which are similar in size and structure to those of prokaryotes. ribosomes chloroplasts organelles Golgi appartus viruses size mitochondria circular loop molecules
Biology
2 answers:
leonid [27]3 years ago
7 0

Answer:

1. Mitochondria

2. Chloroplast

3. the formation of eukaryotic cells

4. DNA

Explanation:

The theory of endosymbiosis was proposed by the Lynn Margulis in 1967 which suggested that the eukaryotic organelles like the mitochondria and chloroplast evolved when another prokaryotic cell engulfed the prokaryotic bacteria.

The mitochondria were formed when the chemosynthetic bacteria were engulfed by the bacteria and the engulfed bacteria formed a symbiotic relationship. Similarly, the chloroplast was originated in the same way when the photosynthetic bacteria were engulfed by another prokaryote.

The evidence which supports their ar:

1. The same size of the organelles to the bacteria

2. The presence of the circular DNA of the organelles like bacteria  

3. The similarity in the 30s and 70s ribosomal subunits.

Aleksandr-060686 [28]3 years ago
5 0

Answer:

Mitochondria, chloroplast, eukaryotic cells and DNA.

Explanation:

The endosymbiont theory explain the evolution of the mitochondria and chloroplast. According to this theory, prokaryotic cells engulf the different bacteria that become an organelle later.

Mitochondria was the first evolved then the chloroplast and engulf by aerobic bacteria. Chloroplast formation occurs in the same way. The origin of the mitochondria and chloroplast occurs before the evolution of the eukaryotic cells. These are semi autonomous organelle and contain their own DNA.

Thus, the answer is mitochondria, chloroplast, eukaryotic cells and DNA.

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aleksklad [387]

Answer:

by testcrossing with a homozygous recessive partner

Explanation:

<u>If a pet cockroach exists whose zygosity is unknown, this can be determined by a test cross. A test cross involves crossing an organisms whose zygosity is unknown with a partner that is homozygous recessive for the same trait.</u>

Let us assume that brown body is represented by the allele B, the dominant allele. The homozygous recessive version would be bb.

The genotype of a brown cockroach whose zygosity is not known can be denoted as B_, where '_' can be a 'B' or a 'b'.

When B_ is crossed with bb:

B_   x   bb

Progeny

2 Bb

2 _b

The phenotype of Bb would be brown (since B is dominant over b) while the phenotype of _b would depend on the zygosity level of the cockroach.

If the unknown genotype is BB, then _b becomes Bb and the phenotype will be a brown body. This means that all the progeny will appear brown. (<em>see the first attached image for the Punnet's square</em>)

In other word, if the unknown genotype is bb, then _b becomes bb and the phenotype will be a alternate color (non-brown) body. This means that 50% of the progeny will appear brown while the remaining 50% will be in the alternate color. (<em>attached</em>

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3 years ago
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Explanation:

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