Compare the processes of mitosis and meiosis.
- (a)Compare the processes of mitosis and meiosis.[4]
- (b)Use your knowledge of how sex is inherited to explain which parent determines the sex of a child.[6]
Mark scheme
Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.
- [4] Mitosis: 2 daughter cells / Meiosis: 4 daughter cells
- Mitosis: diploid / Meiosis: haploid
- Mitosis: chromosome number maintained / Meiosis: chromosome number halved
- Mitosis: occurs in all organs/body cells / Meiosis: occurs in gamete producing organs/named
- Mitosis: produces body cells/used in growth / Meiosis: produces gametes/named
- Mitosis: ref. asexual reproduction / Meiosis: ref. sexual reproduction
- Mitosis: no genetic variation in offspring AW / Meiosis: genetic variation in offspring AW
- [1] Father;
- [5] Max 5 from the following:
- father is XY/contains Y chromosomes ;
- mother is XX/does not contain Y chromosomes ;
- father produces sperm with either X or Y (chromosomes) ;
- mother produces eggs only with X (chromosomes) ;
- sex depends on which sperm fertilises the egg ;
- 1:1 male: female in offspring/AW;
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