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Miracle Learning Centre Science Tuition Question on Human Reproduction. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1 Some women have fertility treatment using hormones to help them to have babies. In one type of treatment, eggs are fertilised outside the body, then inserted into the woman’s womb.

Table 3.1 shows the statistics for this type of treatment from a fertility clinic for one year.

Use the data in the table to help you answer the questions below.

(a) What is the relationship between age and the success of fertility treatment? _______________________________________________________________ _______________________________________________________________ ____________________________________________________________[1]

(b) How many of the women aged 38–40 became pregnant as a result of the fertility treatment?

_______________________________________________________________ ____________________________________________________________[1]

(c) (i) Give one advantage of this type of fertility treatment.

_______________________________________________________________ _______________________________________________________________ ____________________________________________________________[1]

(ii) Give one disadvantage of this type of fertility treatment.

_______________________________________________________________ _______________________________________________________________ ____________________________________________________________[1]

(d) Fig. 3.2 represents four possible types of fertilization and development

Which type of fertilisation and development (A, B, C or D) would produce: (i) one female baby: _______________________________________[1] (ii) identical male twins? ____________________________________[1]

(e) Table 3.3 shows some of the stages in the production of in vitro (test tube) babies.

Suggest two features that the culture medium must have if the production of test tube babies is to be successful.

1 _________________________________________________________ 2 ______________________________________________________[2] [Total:8]

Miracle Learning Centre Answer to Science Tuition Question on Human Reproduction. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition) 1 Some women have fertility treatment using hormones to help them to have babies. In one type of treatment, eggs are fertilised outside the body, then inserted into the woman’s womb. Table 3.1 shows the statistics for this type of treatment from a fertility clinic for one year.

Use the data in the table to help you answer the questions below.

(a) What is the relationship between age and the success of fertility treatment? • success of fertility treatment decreases with age • success of treatment increases after or at ages 40/41/42 [½m @]

(b) How many of the women aged 38–40 became pregnant as a result of the fertility treatment? 45% of 40 = 45/100 X 40 = 18

(c) (i) Give one advantage of this type of fertility treatment. • helps infertile women increases chance of pregnancy • allows single women to become pregnant • reduced risk of STD • storage of eggs for future use • embryo selection [any 1 ans]

(ii) Give one disadvantage of this type of fertility treatment. • risk of failure/still birth • neutral: • side effects • moral issues e.g. unnatural • expensive • results in multiple births [any 1 ans]

(f) Fig. 3.2 represent four possible types of fertilization and development.

Which type of fertilization and development (A, B, C or D) would produce: (iii) one female baby: B [1] (iv) identical male twins? D [1]

(g) Table 3.3 shows some of the stages in the production of in vitro (test tube) babies.

Suggest two features that the culture medium must have if the production of test tube babies is to be successful. • suitable temperature / body temperature / warm • suitable pH (6-7) • oxygen • nutrients / energy from food • suitable concentrations of / right amount of nutrients • sterile • accept clean if qualified

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