Many factors affect the rate of cellular respiration. Pyruvate carboxylase (PC) deficiency is a rare disease. The rate of respiration in the cells of a person with $$\(\mathrm{PC}\)$$ deficiency is much lower than normal. The passage describes the occurrence of PC deficiency in human populations. Complete the passage by using the most appropriate scientific terms. PC deficiency affects one in 250000 people. A person either has the disease or does not, so there are no intermediate forms of the disease. PC deficiency is caused by a genetic mutation in one gene. Whether a person develops the disease is not influenced by factors. The distribution of PC deficiency in human populations shows variation.
Exam No：9700_s23_qp_41 Year：2023 Question No：9(a)
Answer:
1 environmental ;
2 discontinuous;
2 discontinuous;
Knowledge points:
16.1.1 explain the meanings of the terms haploid (n) and diploid (2n)
16.1.2 explain what is meant by homologous pairs of chromosomes
16.1.3 explain the need for a reduction division during meiosis in the production of gametes
16.1.4 describe the behaviour of chromosomes in plant and animal cells during meiosis and the associated behaviour of the nuclear envelope, the cell surface membrane and the spindle (names of the main stages of meiosis, but not the sub-divisions of prophase I, are expected: prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II and telophase II)
16.1.5 interpret photomicrographs and diagrams of cells in different stages of meiosis and identify the main stages of meiosis
16.1.6 explain that crossing over and random orientation (independent assortment) of pairs of homologous chromosomes and sister chromatids during meiosis produces genetically different gametes
16.1.7 explain that the random fusion of gametes at fertilisation produces genetically different individuals
17.1.1 explain, with examples, that phenotypic variation is due to genetic factors or environmental factors or a combination of genetic and environmental factors
17.1.2 explain what is meant by discontinuous variation and continuous variation
17.1.3 explain the genetic basis of discontinuous variation and continuous variation
17.1.4 use the t-test to compare the means of two different samples (the formula for the t-test will be provided, as shown in the Mathematical requirements)
Solution:
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