Vista previa 1 fuera de 7 páginas
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Algunos ejemplos de esta serie de preguntas de práctica
1.
Name and explain the two types of cells found in the human body.
Respuesta: 1. Body cells (Somatic cells): all cells in the body including the skin, the liver, lungs, etc. 2. cells (Gametes): egg cells and sperm cells.
2.
Two chromatids are held together by the?
Respuesta: Centromere.
3.
How many pairs of chromosomes does the human body have? Explain these chromosomes.
Respuesta: The human body has 23 pairs of chromosomes: - 22 pairs of different chromosomes = autosomes - one pair of chromosomes = gonosomes
4.
Define \"karyotype\".
Respuesta: A karyotype is the number and appearance of chromosomes in the nucleus.
5.
State the differences between Meiosis 1 and Meiosis 2.
Respuesta: MEIOSIS 1 1. Crossing over occurs in Prophase 1. 2. Whole chromosomes are arranged at the equator. 3. During Anaphase 1, whole chromosomes are pulled to opposite poles. 4. Chromosome number is halved. 5. Chromosomes are double-stranded in ALL phases. 6. Two new cells have half the chromosomes number as the original cell. MEIOSIS 2 1. No crossing over in Prophase 1. 2. Single chromosomes are arranged at the equator. 3. During Anaphase 2, single chromatids are pulled to the opposite poles. 4. Chromosome number remains the same. 5. Chromosomes are single-stranded in ALL phases. 6. Two new cells formed have the same chromosomal number as the original cell in Prophase 2.
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