Dr / Hadeer Ayman

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.

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.

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.

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.

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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.

The smallest pair of chromosomes is pair number 22.

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.

In the chromosomal pattern, pair number 23 is the largest in size compared to the other pairs of chromosomes.

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".

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.

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%.

When two plants with pure red and white flowers are crossbred, the resulting generation will have 100% red flowers.

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).

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.