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تمارين أونلاين Biology | Lack of dominance
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سؤال 1 of 11
1. سؤال
Which of the following is true about the main difference between somatic and sex chromosomes?
- A – Sex chromosomes exist in four pairs, while somatic chromosomes exist in 22 pairs.
- B – Somatic chromosomes are different in males and females, while sex chromosomes are similar in both sexes.
- C – Sex chromosomes exist in one pair, while somatic chromosomes exist in 24 pairs.
- D – Somatic chromosomes are similar in both males and females, while sex chromosomes differ between males and females.
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سؤال 2 of 11
2. سؤال
Which of the following is likely to be the consequence if an embryo inherits X chromosomes from both parents, making the total number of chromosomes 46
44 somatic and 2 sex chromosomes?
- A – The embryo will develop into a female child.
- B – The embryo will not develop and will die.
- C – The embryo will lack female hormones.
- D – The embryo will develop into a male child.
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سؤال 3 of 11
3. سؤال
Which gamete is responsible for determining the sex of a fetus?
- A – Egg
- B – Sperm
- C – Neither
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سؤال 4 of 11
4. سؤال
Which of the following is true about X and Y chromosomes?
- A – Both of them are sex chromosomes.
- B – Both of them cannot determine the sex of an embryo.
- C – Both of them must be found in males and females.
- D – Both of them are identical in their shape.
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سؤال 5 of 11
5. سؤال
Which of the following correctly describes the chromosomes contained within a human female somatic cell?
- A – 46 autosomes + XY
- B – 23 autosomes + XY
- C – 44 autosomes + XX
- D – 46 autosomes + XX
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سؤال 6 of 11
6. سؤال
A couple are expecting a child. What is the probability, in percent, that this child will be born female?
a-100%
b-25%
c-50%
d-75%
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سؤال 7 of 11
7. سؤال
Which of the following is true about a sex chromosome?
- A – It is a chromosome that is always found in a homozygous combination.
- B – It is a chromosome whose main role is to prevent ageing.
- C – It is a chromosome that determines the sex of a human being.
- D – It is a chromosome that is found in males only.
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سؤال 8 of 11
8. سؤال
Why do gametes contain half the chromosome number found in somatic cells?
- A – Because they are formed by the mitotic division of certain cells in gonads.
- B – Because they are formed by the meiotic division of certain cells in gonads.
- C – Because they are formed by the binary fission of certain cells in gonads.
- D – None of the answers are correct
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سؤال 9 of 11
9. سؤال
Which of the following is true about sex determination?
- A – Only an ovum with an X chromosome can determine the gender of the baby.
- B – A sperm with an X chromosome cannot determine the gender of the baby.
- C – Only an ovum with a Y chromosome can determine the gender of the baby.
- D – A sperm with a Y chromosome can determine the gender of the baby.
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سؤال 10 of 11
10. سؤال
Which of the following is true about sex determination?
- A – Only an ovum with an X chromosome can determine the gender of the baby.
- B – A sperm with an X chromosome cannot determine the gender of the baby.
- C – Only an ovum with a Y chromosome can determine the gender of the baby.
- D – A sperm with a Y chromosome can determine the gender of the baby.
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سؤال 11 of 11
11. سؤال
A man whose blood group (pure) contains antigen (B)
Married to a woman whose blood group doesn’t contain antigens (A) and (B). what is the probability for the percentage of blood groups containing (anti-a) among children?
a- 25% b-50% c-75% d-100%
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