Which of the following contribute(s) to the \"genetic variation\"? A. Anaphase I

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Which of the following contribute(s) to the "genetic variation"? A. Anaphase I B. Crossing over C. Both of the above choices D. Mitosis The unknown phenotype is "typically" crossed with the following in a test cross: A. Homozygous dominant B. Homozygous recessive C. Heterozygous D. Carrier A "tall plant" (unknown genotype) was tested in a test cross to produce 15 tall and 15 short plant. What is the genotype of the "unknown" plant? A. TT B. Tt C. tt D. All of the above In what phase of the cell cycle does DNA replication take place? A. G I phase B. G II phase C. S phase In what phase of the cell cycle does a cell "mature and grow"? A. G I phase B. G II phase C. S phase In what phase of the cell cycle do cells get prepared for the division and centrosome (centriole pair) appears? A. G I phase B. G II phase C. Synthesis phase D. All of the above Products of mitosis are: A. Structurally identical cells B. Functionally identical cells C. Genomically or genetically identical cells D. All of the above During what phase of mitosis is chromatin converted into the visible chromosomes by coiling & supercoiling? A. Prophase B. Metaphase C. Anaphase D. Telophase Centromere breaks or "centromere splits" into two chromatids during following mitotic phase: A. Prophase B. Metaphase C. Anaphase

Explanation / Answer

Answer of the following Question

Question 7 Answer c

Crossing over: exchange of some parts of DNA in a homologous chromosome in the area where they come in contact with each other. Then this chromosome splits, during meiosis, to form a daughter cell (gamete) with a haploid number of chromosomes. During fertilization, the two gametes fuse into one cell containing now a diploid number of chromosomes. This process leads to genetic diversity and variation

but in the case of anaphase I homologous chromosomal separation which is having some genetic exchange during the crossing over of prophase 1.

Mitosis- no genetic variation because no crossing over and The sister chromatids are then pulled apart by the mitotic spindle which pulls one chromatid to one pole and the other chromatid to the opposite pole during anaphase

Question No8-B because if you suppose is phenotype homozygous dominant AA then all trait will be dominant and if suppose the phenotype is heterozygous then some are dominant and some will recessive

and if suppose phenotype recessive then all will recessive in the trait.

Question NO 10 Anser C

S-phase, It's come under the Interphase where the genomes replicate and genomic content become double.

Question No 11 answer- B

when the cell enters in division phase then the cell will sythesize all the proteins by transcription and translation in G2 phase which will promote for cell division So most of the maturity and growth of the cell in G2 phase.

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