Biology Answers

the process of pregnancy

The diploid number of chromosomes for human skin cells is 46. If the cells undergo mitosis, what will be the diploid number of chromosomes in the new skin cells?

In a certain plant, both purple x purple and purple x blue produce purple and blue coloured progeny, but blue x blue gives rise only to blue.

2.1. What does this tell you about the genotypes of blue- and purple-flowered plants [5 marks]

2.2. Which gene is dominant

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2. A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed. However, some mutations are spontaneous. Do the necessary research and discuss:

(i) What do we mean by mutations being spontaneous. (1)

(ii) Further discuss how the following can lead to mistakes at the time of DNA

replication (a) A base analogy (b) Nitric acid (c) UV light. (9)

(iii) Discuss the types of mutations under the following headings giving an example in each case: Silent Mutations, Non- Synonymous Mutations, Chromosomal mutations, and DNA Non-coding region Mutations (10)

i am a student of Nursing licensed vocational nurse (LVN), i have a project in nursing Geriatrics, i want to confirm if your company can help me solve my Geriatrics project

1. Compare the anatomical and physiological features of the respiratory system of a bovine and that of an avian.                                                                          

2. Explain why avian species are more prone to respiratory diseases than other animals

Two different islands on the Swedish west coast have different dense populations of hares. What could be the reasons for this?

Why are there largely different plant species in a forest compared to an open field?