How many pair(s) of autosomes are present in human genome? A. 1 B. 22 C. 23 D. 4
ID: 99759 • Letter: H
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How many pair(s) of autosomes are present in human genome? A. 1 B. 22 C. 23 D. 46 Identify the number of chromosomes in a haploid set (egg/sperm) in humans? A. 1 B. 22 C. 23 D. 46 Who re-discovered Mendelian genetics in 1900 after his death in 1886? A. Carl Correns B. Hugo DeVries C. Eric Von Tschemak D. All of the above What is allele? A. Pure genes B. Pure proteins C. Pure DNA D. Different form of genes What is considered to be the "phenotype" of an organism? A. Physical appearance B. Genetic makeup C. Number of chromosome in somatic cells D. Number of chromosomes in sperm/egg What do you use Punnet square for? A. Separate male & female B. Estimate possible recombinations C. Combine homozygous alleles D. Combine heterozygous alleles 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?Explanation / Answer
1) Autosomal chromosomes are 22 pairs in human and one pair of sex chromosomes hence option B is right answer.
2) Haploid set have 23 chromosomes hence option C is right answer. Other are wrong options.
3) All of these rediscovered Mendelian genetics independently hence option D is right answer.
4) Alleles are alternate form of gene hence D is right option.
5) Physical appearance is considered phenotypes hence A is right answer. other are not right options.
6) Punnet square is used to know possible recombination of progeny hence option B is right answer.
7) Crossing over produce variations hence B is right option. Crossing over take place during pachytene of prophase 1.
Other are not right answer.
8) Homozygous recessive is used in test cross to know genotype of unknown. Hence B is right answer.
9)When heterozygous tall crossed with Homozygous recessive than this ratio is possible hence B is right answer.
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