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JulsSmile [24]
3 years ago
10

What was the most important invention to marine science?

Biology
2 answers:
alina1380 [7]3 years ago
4 0

Answer:

The invention of the marine chronometer by John Harrison in the middle of the 18th century made true ocean navigation possible. (1) Marine Chronometer In the early 18 th century, knowing your whereabouts on the face of the globe was difficult. As the world’s greatest global power, Britain was extremely keen to remedy that.

alina1380 [7]3 years ago
3 0
The invention of the marine chronometer by John Harrison in the middle of the 18th century made true ocean navigation possible.
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Give up on life and get a education stop siting on the enternet

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The cross of an aa male and Aa female produced an offspring with the genotype AAa. Therefore, the resulting offspring has 3 copi
creativ13 [48]

Answer:

The correct answer is option d.

Explanation:

Based on the given question, the genotype of the male parent is aa, the genotype of the female parent is Aa, and the genotype of the offspring is AAa, showing trisomy characteristics. In the given case, the existence of two A chromosomes shows that the chromosomes non-disjunction at the time of gametogenesis have taken place in the female as she is the only one possessing A allele. Hence, it can be concluded that the disjunction is maternal in characteristic.  

The duplication of chromosomes takes place at the time of the S-phase of meiosis. Thus, after going through S-phase, the karyotype of the cell will be AAaa (maternal gametogenesis), this set of the chromosome is termed as homologous pair, and the pair of AA or aa is termed as sister chromatids.  

The meiotic disjunction takes place in two phases. First, in meiosis I disjunction, in this separation of homologous chromosomes takes place, that is, the maternal cell AAaa get differentiated into aa and AA daughter cells. Secondly, in meiosis II disjunction, the separation of sister chromatids takes place into two independent chromosomes, that is, the formation of two cells each comprising chromosome A from the AA cell and the formation of two cells each with chromosome a from the aa cell.  

Thus, the phenomenon of non-disjunction would have taken place at the time of meiosis II in the case of a female gamete to exhibit two A chromosomes. Hence, the correct answer is option d.  

4 0
3 years ago
Which of the following can be said about the use of agriculture
Mama L [17]
One of the use of Agriculture is that It bears no effect on the environment

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5 0
3 years ago
Plants, algae, and many single-celled organisms can photosynthesize using a specialized cell organelle called a chloroplast. Do
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Answer:

Yes

Explanation:

<em>The chloroplast is an organelle through which photosynthesis takes place. While the light reaction takes place in the thylakoid membrane of the chloroplast, the light-independent reaction or the Calvin cycle takes place in the stroma of the chloroplast. </em>

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The chromosomes in a diploid cell are in pairs, the two chromosomes which make up one pair are called:
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Homologous chromosomes.
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