Retroviruses are a. The causes of cholera and sickle cell disease b. The most pr

Question

Retroviruses are a. The causes of cholera and sickle cell disease b. The most primitive forms of life on earth c. Able to carry out a form of sexual reproduction unknown in animals d. Able to insert their genetic material into the genome of a host cell e. Capable of infecting prokaryotic cells only In the formula for determining a population's genotype frequencies, the p? in the term 2pq is necessary because: a. Heterozygotes have 2 alleles b. The population is haploid c. Heterozygotes can come about in 3 ways d. The population is doubling in number e. There are only 2 types of homozygous genotypes Which of the following is not a prezygotic isolating mechanism? a. Prevention of fertilization b. Death of hybrid fetuses c. Temporal isolation d. Individuals of 2 populations live in separate areas and do not encounter one another e. All of the above are examples of prezygotic isolating mechanisms Which of the following is an invertebrate with an open circulatory system? A. Roundworm B. Coral C. Cow D. Crab E. Tapeworm The cap of a mushroom is typically its site for a. Converting the energy in sunlight into chemical energy b. Seed production c. Binary fission d. Spore production e. abiogenesis

Explanation / Answer

1.Retrovirus are able to insert their genetic material into the genome of the host cell. ( Retroviruses convers their RNA into DNA by using Reverse transcriptase and then inserts the DNA into host bacterial DNA by using Integrase enzyme)

2.In the fomula of determining the genotype frequencies of a population, 2pq is used because there are two heterozygous allele.

Lets P(A)= p, P(a)= q P(Aa)= pq

So because there is 2 Aa (pq*2) allele so the term 2pq comes in total probability (p2+2pq+q2)

3. Ans e. All the above are methods of prezygotic isolation

4. Open circulatory system is present in Crab. ( Arthopod).

5. The cap of mushroomis typically its site for Spore production and storage. Ans d)

A a A AA (p2) Aa(pq) a Aa(pq) aa (q2)

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