GCSE BIOLOGY Foundation Tier Paper 2F rating june 2022

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GCSE BIOLOGY Foundation Tier Paper 2F F 2 *02* IB/M/Jun22/8461/2F Do not write outside the Answer all questions in the spaces provided. box 0 1 Maple syrup urine disease (MSUD) is a rare inh... erited human condition. The allele for MSUD is recessive. 0 1 . 1 What is a recessive allele? [1 mark] Tick () one box. An allele expressed only if a person has two copies of the allele An allele expressed only if it is inherited from the male parent An allele expressed when it is found on only one of the chromosomes Figure 1 shows the inheritance of MSUD in one family. Figure 1 0 1 . 2 The symbol is not in the key for Figure 1. What would this symbol represent? [1 mark] 3 *03* Turn over ► IB/M/Jun22/8461/2F Do not write outside the Persons 1 and 2 in Figure 1 have a child with MSUD and some children box without MSUD. 0 1 . 3 Complete Figure 2 to show the possible genotypes of the children. Use the following symbols: N = allele for not having MSUD n = allele for MSUD [2 marks] Figure 2 N n N Nn n 0 1 . 4 What is the phenotype of a person with the genotype Nn? [1 mark] 0 1 . 5 What percentage of the offspring in Figure 2 will have MSUD? [1 mark] Tick () one box. 25% 50% 75% 100% Question 1 continues on the next page Person 1 Person 2 4 *04* IB/M/Jun22/8461/2F Do not write outside the box 0 1 . 6 Which scientific term describes the allele N? [1 mark] Tick () one box. Dominant Genetic Heterozygous 0 1 . 7 Alleles are found in the nucleus of a cell. What chemical substance are alleles made from? [1 mark] 0 1 . 8 People with MSUD must eat a special diet to reduce their intake of some types of amino acid. Which component of the diet is made of amino acids? [1 mark] Tick () one box. Carbohydrates Minerals Proteins 9 5 *05* Turn over ► IB/M/Jun22/8461/2F Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 6 *06* IB/M/Jun22/8461/2F Do not write outside the box 0 2 Many human actions are reflexes. 0 2 . 1 Which statement describes a reflex action? [1 mark] Tick () one box. A reflex action does not need a sense organ. A reflex action is a slow action. A reflex action is automatic. Figure 3 shows the nerve pathway for a reflex action. The arrows show the direction of the nerve impulse. Figure 3 7 *07* Turn over ► IB/M/Jun22/8461/2F Do not write outside the 0 2 box . 2 Draw one line from each part of the nerve pathway to the name of that part. Use Figure 3. [3 marks] Part of nerve pathway Name of part A B C Motor neurone Receptor Relay neurone Spinal cord 0 2 . 3 Which two human actions are reflexes? [2 marks] Tick () two boxes. Blinking when an insect flies into the eye Catching a ball in a playground game Playing a musical instrument Removing the hand from a hot object Writing a message to a friend Question 2 continues on the next page 8 *08* IB/M/Jun22/8461/2F Do not write outside the Students investigated their reaction times using a computer program. box Figure 4 shows a sequence of two screens in the computer program. Figure 4 This is the method used. 1. Open the reaction time program. 2. When the screen turns from red to green, touch the screen as quickly as possible. 3. Record the reaction time shown on the screen. 4. Re-set to the red screen. 5. Repeat steps 2 to 4 four more times. 6. Repeat steps 1 to 5 for each student. Table 1 shows the results. Table 1 Test Reaction time in milliseconds Student P Student Q Student R Student S 1 317 310 367 320 2 309 293 352 304 3 290 312 350 315 4 333 307 359 308 5 328 312 635 313 Mean 315 307 357 X 9 *09* Turn over ► [Show More]

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