Dr / Hadeer Ayman
- 1.
يختلف الطرز الكروموسومى لذكر الانسان عن الانثى فى ............
- A.
عدد الكروموسومات الجنسية
- B.
نوع الكروموسومات الجنسية
- C.
ترتيب الكروموسومات الجنسية
- D.
ترتيب الكروموسومات الجسدية
Correct Answer
B. نوع الكروموسومات الجنسيةExplanation
The explanation for the given correct answer is that the chromosomal type of the sex chromosomes differs between males and females. Males have one X and one Y chromosome, while females have two X chromosomes. This difference in chromosomal type determines the biological sex of an individual.Rate this question:
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- 2.
فى الطرز الكروموسومى يكون زوج الكروموسومات رقم (23) أكبر فى الحجم من
- A.
باقى أزواج الكروموسومات
- B.
زوج الكروموسومات رقم 6
- C.
زوج الكروموسومات رقم 7
- D.
زوج الكروموسومات رقم 8
Correct Answer
D. زوج الكروموسومات رقم 8Explanation
In the chromosomal pattern, pair number 23 is the largest in size compared to the other pairs of chromosomes.Rate this question:
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- 3.
تحتوى كل من نواة الخلية الجسدية ونواة المشيج فى الانسان على .......... و ................ على الترتيب
- A.
2n , n من الصبغيات
- B.
46 DNA جزيئ / جزيئ DNA 23
- C.
46 كروموسوم 23 / كروموسوم
- D.
كل ما سبق
Correct Answer
D. كل ما سبقExplanation
The correct answer is "كل ما سبق" because both the nucleus of the somatic cell and the nucleus of the sperm in humans contain 2n, which means a diploid number of chromosomes (46 in humans). Additionally, both nuclei contain DNA molecules, with each human cell containing 46 DNA molecules and each sperm cell containing 23 DNA molecules. Therefore, the correct answer encompasses all the information provided in the question.Rate this question:
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- 4.
تختلف الحيوانات المنوية للانسان فيما بينها من حيث ............
- A.
عدد الكروموسومات التى تحملها
- B.
حجم الكروموسومات الجسدية التى تحملها
- C.
نوع الكروموسوم الجنسى الذى تحمله
- D.
كل ما سبق
Correct Answer
C. نوع الكروموسوم الجنسى الذى تحملهExplanation
The correct answer is "نوع الكروموسوم الجنسى الذى تحمله" (the type of sex chromosome they carry). This is because the sex chromosomes determine the sex of an individual. In humans, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY). The type of sex chromosome carried by the sperm determines the sex of the offspring.Rate this question:
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- 5.
الحيوان المنوى فى الانسان يحمل ..........
- A.
الصبغى الجنسى X < Y
- B.
نصف عدد الكروموسومات فى الخلية الجسدية
- C.
23 كروموسوم فقط
- D.
كل ما سبق صحيح
Correct Answer
D. كل ما سبق صحيحExplanation
The correct answer is "كل ما سبق صحيح" (All of the above is correct). This means that all of the statements mentioned in the options are true. The first statement states that the sperm in humans carries the sex chromosome X or Y, which is true as sperm can carry either the X or Y chromosome, determining the sex of the offspring. The second statement states that the number of chromosomes in a somatic cell is half, which is also true as somatic cells are diploid and have two sets of chromosomes. The third statement states that there are only 23 chromosomes, which is true as human cells have 23 pairs of chromosomes. Therefore, all of the statements are correct.Rate this question:
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- 6.
زوج الكروموسومات الاصغر فى الحجم هو الزوج رقم
- A.
1
- B.
7
- C.
22
- D.
23
Correct Answer
C. 22Explanation
The smallest pair of chromosomes is pair number 22.Rate this question:
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- 7.
العالمان اللذان توصلا الى اسس النظرية الكروموسومية هما
- A.
يورى وميلر
- B.
واطسون وكريك
- C.
مندل وساتون
- D.
ساتون وبوفرى
Correct Answer
D. ساتون وبوفرى -
- 8.
ينتج العدد الزوجى للكروموسومات عندما .........
- A.
تنقسم خلايا ميتوزيا n2
- B.
تحدث عملية الاخصاب
- C.
يتكون الزيجوت
- D.
جميع ما سبق صحيح
Correct Answer
D. جميع ما سبق صحيحExplanation
The correct answer is "جميع ما سبق صحيح" which means "all of the above are correct". This means that the even number of chromosomes can result from any of the mentioned processes: cell division (mitosis) with n2 chromosomes, fertilization, or the formation of a zygote.Rate this question:
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- 9.
اذا مرت خلية بالمراحل التالية n2 ------> n ---------> n2 -------->- n2 يكون قد حدث لها ...............
- A.
انقسام ميتوزى ثم ميوزى ثم أخصاب
- B.
أنقسام ميوزى ثم أخصاب ثم انقسام ميتوزى
- C.
اخصاب ثم انقسام ميوزى ثم ميتوزى
- D.
انقسام ميتوزى ثم إخصاب ثم انقسام ميوزى
Correct Answer
B. أنقسام ميوزى ثم أخصاب ثم انقسام ميتوزىExplanation
The given sequence of stages (n2 -> n -> n2 -> n2) indicates that the cell has undergone meiosis, fertilization, and then mitosis. This sequence is consistent with the process of sexual reproduction, where meiosis produces haploid gametes, fertilization combines two gametes to form a diploid zygote, and mitosis allows for growth and development of the zygote. Therefore, the correct answer is "أنقسام ميوزى ثم أخصاب ثم انقسام ميتوزى".Rate this question:
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- 10.
عند تزاوج رجل وامراة تركيبهما الجينى ( Aa) يكون احتمال ظهور التركيب الجينى (AA) بين الابناء هو ........................%
- A.
25
- B.
50
- C.
75
- D.
100
Correct Answer
A. 25Explanation
When a man and a woman with the genetic composition (Aa) reproduce, there is a 25% chance that the genetic composition (AA) will appear in their offspring. This is because each parent can pass on either the dominant allele (A) or the recessive allele (a) to their offspring. Therefore, there is a 50% chance that the offspring will receive the dominant allele (A) from one parent and a 50% chance that they will receive the recessive allele (a) from the other parent. The combination of receiving the dominant allele (A) from both parents results in the genetic composition (AA), which has a 25% probability of occurring.Rate this question:
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- 11.
النسبة الانعزالية فى الجيل الثانى للسيادة التامة حسب القانون الاول لمندل هى
- A.
3 : 1
- B.
1 : 1
- C.
3 : 0
- D.
1 : 2 : 1
Correct Answer
A. 3 : 1Explanation
The correct answer is 3 : 1. This ratio indicates that for a particular trait in the second generation of complete dominance, there are three individuals with the dominant phenotype for every one individual with the recessive phenotype. This ratio is consistent with Mendel's first law of inheritance, which states that when two individuals with contrasting traits are crossed, the resulting offspring will have a 3:1 ratio of dominant to recessive phenotypes.Rate this question:
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- 12.
اذا كانت نسبة الامشاج من النوع (ab) عند التزاوج هى 50% فان التركيب الجينى للابوين .............
- A.
AaBb × AaBb
- B.
AABB × AaBb
- C.
AABB × aabb
- D.
Aabb × aabb
Correct Answer
C. AABB × aabbExplanation
The given question is asking about the gene composition of the parents when the proportion of the (ab) type of alleles is 50% during mating. The correct answer, AABB x aabb, suggests that one parent has two dominant alleles (AABB) and the other parent has two recessive alleles (aabb). This pairing would result in offspring that are heterozygous for the dominant alleles (AaBb).Rate this question:
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- 13.
اذا علمت ان صفة المهقة التى تتميز بغياب صبغة الميلانين فى الجلد والشعر والعيون هى صفة متنحية فى الانسان ,, فعند تزاوج رجل أمهق بامراة تحمل جين المهقة يكون احتمال ظهور الصفة فى الابناء .............%
- A.
25
- B.
50
- C.
75
- D.
100
Correct Answer
B. 50Explanation
When a man with albinism (lacking melanin pigment in the skin, hair, and eyes) mates with a woman carrying the albinism gene, there is a 50% chance of the trait appearing in their offspring. This is because albinism is a recessive trait, meaning it requires two copies of the gene for it to be expressed. The man with albinism has two copies of the gene, while the woman carries only one. Therefore, there is a 50% chance that the offspring will inherit one copy from the father and express the trait.Rate this question:
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- 14.
أذا تزوجت سيدة مصابة بارتخاء الجفن العلوى للعين وهى صفة تعتمد على وجود جين سائد وكان والدها مصابا بنفس الصفة ووالدتها طبيعية ووالد امها طبيعيا كما ان زوجها طبيعيا فان نسبة الابناء المتوقع ان تظهر عليهم الصفة هى ..................... %
- A.
100
- B.
75
- C.
50
- D.
25
Correct Answer
C. 50Explanation
If the woman is affected by upper eyelid ptosis and it is a dominant trait, and her father was also affected by the same trait while her mother was normal, and her maternal grandfather was also normal, and her husband is normal, then the expected percentage of children who will show the trait is 50%.Rate this question:
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- 15.
عند تهجين نباتات بازلاء احدهما تحمل ازهارا قرمزية نقية مع اخر يحمل ازهارا بيضاء فان نسبة الجيل الناتج يكون .................
- A.
100 % ازهار قرمزية
- B.
قرمزية75 : 25 بيضاء
- C.
قرمزية 50: 50 بيضاء
- D.
100 % ازهار بيضاء
Correct Answer
A. 100 % ازهار قرمزيةExplanation
When two plants with pure red and white flowers are crossbred, the resulting generation will have 100% red flowers.Rate this question:
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Mar 21, 2023Quiz Edited by
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Mar 01, 2019Quiz Created by
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