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aev [14]
3 years ago
10

Why might a point mutation in DNA make a diffrence inb the level of proteins activity?

Biology
1 answer:
gogolik [260]3 years ago
8 0

Answer:

A point mutation is a type of genetic mutation where the single nucleotide base pair is changes.

There can be a single nucleotide base which is changed, deleted or inserted from a sequence of DNA or RNA.

The proteins produced may be faulty proteins. The consequences can be moderately predictable based on the specificity of the mutation.

Example: Cystic fibrosis, Sickle cell anemia and Tay-Sachs are some of the disease caused by point mutation.

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3 years ago
Seed size in a plant is a polygenic characteristic. A grower crosses two pure-breeding varieties of the plant and measures seed
Juli2301 [7.4K]

Answer:

The F1 progeny is completely heterozygous for the <em>loci</em> of interest since they were obtained by mating between two pure-breeding plant lines. In the next generation, the backcross progeny will have homo-zygous individuals and therefore they will be more variable, resulting from meiosis in F1 hybrids

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An F1 resulting from the cross between two pure-breeding plant lines will produce all hybrid individuals, all of them genetically (and phenotypically) identical. Meiosis in F1 hybrids is well known to produce homo-zygous genotypes and thus increases genetic diversity in progeny. For instance, for a single <em>locus</em>, the expected ratio of genotypes obtained from crossing two heterozygous parents is 1:2:1, i.e., one homo-zigous dominant individual, two heterozygous individuals (genetically identical to the parents) and one homo-zygous recessive individual; while the expected phenotypic ratio is 3:1 (i.e., 3 dominant expressing: 1 recessive expressing​).

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3 years ago
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It is passed from old cells to new cells during cell division.

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