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Answer:
Viruses have to invade the body of a host organism in order to replicate their particles. Therefore, most viruses are pathogenic. The main difference between bacteria and virus is that bacteria are living cells, reproducing independently and viruses are nonliving particles, requiring a host cell for their replication.
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Answer:
The correct answer is option B, Encourage people in the neighborhood to use more disposable products.
Explanation:
The best way to reduce the waste is to stop its negative impact at the source of generation. In a neighbor hood, all the house can be considered as a source of waste generation. Thus if people are encouraged to use disposable product, it would be very easy to just collect and dump the waste without segregation. This will save time, money and effort.
Answer:
The answer is (d) Three genes, each with two alleles that act additively.
Explanation:
1/ The genotype of P is AABBCC and aabbcc, for example. Then, F1 should be AaBbCc.
The genotype of individuals with n heterozygous pair is 2^n. Thus, in this case, the number of genotype in F2 should be 2^3 * 2^3 = 8 * 8 = 64. We can get this conclusion by analyzing the number of 6 cm tails in F2: 1/64 with genotype aabbcc, and the number of 30 cm tails: 1/64 with genotype AABBCC. These two genotypes is as same as the ancestor in this experiment.
The genotype of an F2 piglet with an 18 cm tail is AaBbCc. If these genes show dominance, the tail lenght of F2 will be 30 cm. And there are 7 possible phenotypes. Thus, we can conclude that the genes act additively.
2/ 18 cm tail F2: AaBbCc, and 6 cm tail: aabbcc.
The offspring genotypes are:
- 18 cm AaBbCc, 14 cm AaBbcc, 14 cm AabbCc, 10 cm Aabbcc
- 14 cm aaBbCc, 10 cm aaBbcc, 10 cm aabbCc, 6 cm aabbcc
The frequency of piglets with 14 cm tail length should be 3/8 = 37.5%.
