4 (a) A karyogram is a picture of the chromosomes found in the nucleus of a single cell - Edexcel - GCSE Biology Combined Science - Question 4 - 2019 - Paper 1
Question 4
4 (a) A karyogram is a picture of the chromosomes found in the nucleus of a single cell. Figure 4 shows a human karyogram.
(i) State two reasons why this karyogram ... show full transcript
Worked Solution & Example Answer:4 (a) A karyogram is a picture of the chromosomes found in the nucleus of a single cell - Edexcel - GCSE Biology Combined Science - Question 4 - 2019 - Paper 1
Step 1
State two reasons why this karyogram cannot be from a gamete (sex cell).
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Answer
Gametes only have 23 chromosomes / chromosomes are not in pairs.
Because it has an X and a Y chromosome.
Step 2
State the gender shown by this karyogram.
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Answer
male
Step 3
Complete the Punnett square to show how gender is inherited.
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Answer
| X | Y
---|---|---
X | XX | XY
Y | XY | YY
Step 4
State the probability that a child will be male.
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Answer
The probability that a child will be male is 50%.
Step 5
Name structure Z.
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Z is the midpiece of the sperm.
Step 6
Explain why sperm B will be more likely to fertilise an egg than sperm A if they were both released at the same time.
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Sperm B is likely to have a larger midsection, which contains more energy resources, allowing it to swim faster and more efficiently towards the egg compared to sperm A.
