HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a piece of a chromosome breaks off and reattaches
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an organism has an extra set of chromosomes.
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a mutagen speeds the mutation rate.
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an insect develops a resistance to a pesticide.
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Detailed explanation-1: -Introduction. Polyploidy is the heritable condition of possessing more than two complete sets of chromosomes. Polyploids are common among plants, as well as among certain groups of fish and amphibians. For instance, some salamanders, frogs, and leeches are polyploids.
Detailed explanation-2: -polyploidy, the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes. In other words, the polyploid cell or organism has three or more times the haploid chromosome number.
Detailed explanation-3: -Polyploids are organisms with three or more complete chromosome sets. Polyploidization is widespread in plants and animals, and is an important mechanism of speciation.
Detailed explanation-4: -A haploid cell (n) has 23 chromosomes (typically in the ovum or sperm). If a cell’s chromosomes are an exact multiple of 23 (46, 69, 92 in humans), those cells are referred to aseuploid. Polyploid cells are euploid cells with more than the normaldiploid number of 46 (2n) chromosomes: 3n, 4n.
Detailed explanation-5: -This is because the chromosomes can still pair up during meiosis and produce functional gametes. This explains why most naturally occurring polyploids have an even number of chromosome sets.