Answer and Explanation: The correct answer is option e) late prophase or metaphase.
Metaphase At this stage, the chromosomes are distinguishable when viewed through a microscope. Metaphase chromosomes are used in karyotyping, a laboratory technique for identifying chromosomal abnormalities.
MetaphaseSo, the correct answer is 'Metaphase'.
The best mitotic stage for chromosome analysis is prometaphase or metaphase. A typical metaphase chromosome consists of two arms separated by a primary constriction or centromere.
For karyotyping the chromosomes must be isolated from cells in the metaphase, which is the stage of the cell cycle in which the chromosomes assume their characteristic condensed, discrete shape.
The laboratory specialist uses a microscope to examine the size, shape, and number of chromosomes in the cell sample. The stained sample is photographed to show the arrangement of the chromosomes. This is called a karyotype. Certain problems can be identified through the number or arrangement of the chromosomes.
S phase is the period of wholesale DNA synthesis during which the cell replicates its genetic content; a normal diploid somatic cell with a 2N complement of DNA at the beginning of S phase acquires a 4N complement of DNA at its end.
, spireme (spī'rem, spī'rēm), Term formerly applied to the first stage of mitosis or meiosis (prophase) during which extended chromosome filaments have the appearance of a loose ball of yarn, on the incorrect supposition that the filaments were continuous and later broke apart to form individual chromosomes. [G.
During interphase (1), chromatin is in its least condensed state and appears loosely distributed throughout the nucleus. Chromatin condensation begins during prophase (2) and chromosomes become visible. Chromosomes remain condensed throughout the various stages of mitosis (2-5).
Metaphase is the best stage to count the number of chromosomes and study their morphology.
The best time to isolate chromosomes for a karyotype is metaphase because: the chromosomes are shortest and...
metaphaseIB Biology Year 1 ReviewQuestionAnswerWhich phase of cell division is photographed in order to make a karyotype?metaphaseWhich process is used in polymerase chain reaction (PCR)?DNA replicationIf the haploid number of a species is 14, how many chromatids will there be in metaphase I in a dividing diploid cell?56116 more rows
The enzyme telomerase solves the problem of replication at the ends of linear chromosomes by which method?
In 1956 Tijo and Levan first successfully counted human chromosomes. What is the reason it took so many years to do so? a) Chromosomes were piled up on top of one another in the nucleus.
The pedigree in figure 15. 3 shows the transmission of a trait in a particular family. Based on this pattern of transmission, the trait is most likely...
a) Base pairings create unequal spacing between the two DNA strands.
e) The 5' and 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
Reason C- Drosophila chromosomes can be easily distinguishable under a light microscope.
A woman is found to have 47 chromosomes, including three X chromosomes. Which of the following describes her expected phenotype?
A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). It's genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?
Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. If doubly heterozygous SsNn cactuses were allowed to self-polinate, the F2 would segregate into what ratios?