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natulia [17]
2 years ago
7

True or false? the first vaccine developed was for polio. b. false 2. true or false? louis pasteur developed a rabies vaccine.

Biology
1 answer:
Gennadij [26K]2 years ago
3 0

The smallpox vaccine, introduced by Edward Jenner in 1796, was the first successful vaccine to be developed. hence first statement is<u> False.</u>

Louis Pasteur developed a vaccine for Rabies hence, the second statement is true.

However, Pasteur's rabies vaccine represented the first effective post-exposure treatment for people bitten by rabid animals, and Jenner's smallpox vaccine resulted in the eradication of smallpox. Additionally, the polio vaccine, given since its discovery in 1950, is resulting in the eradication of polio (in the years 2004–2005). Despite the existence of a relatively powerful vaccine, efforts to completely eradicate rabies are impractical because, unlike smallpox and polio, rabies may infect both domesticated and wild mammalian species.

Learn more about Smallpox here-

brainly.com/question/10128292

#SPJ4

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Answer:

prophase 1(Homologous chromosomes pair to form a tetrad.

prophase 1(Crossing-over may occur between the non-sister chromatids).

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Metaphase 2 ( The haploid number of duplicated chromosomes line up at the metaphase plate.

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Explanation:

Meiosis is a type of cell division that gives rise to gametes ( offsprings). This type of cell division occurs only in the reproductive organs. A diploid cell has two sets of chromosomes: one from the female parent and the other one from the male parent. When the diploid cell undergoes meiosis, the chromosome replicate once and the nucleus and cell duplicate twice giving rise to four haploid gamete cells.

The phases of meiosis occurs in two step divisions. Homologous pairs separate during the first round cell division which occurs in MEIOSIS 1 while the sister chromatids separate in the second nuclear division called MEIOSIS 2.

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When the nucleus divides for the first time, the chromosomes in a given pair( not the chromatids) separate and move to opposite ends of the cell. This results in only half the number of chromosomes going to each daughter cell.

During the second nuclear division, the chromatids separate and move to opposite ends of each daughter cell giving rise to four gamete cells, each with a haploid number of chromosomes.

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During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material. Gametes gain the ability to be genetically different from their neighboring gametes after crossing over occurs.

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