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Genrish500 [490]
3 years ago
11

This type of mutation is called a __________ mutation when there is a simple change in one base of the gene sequence.

Biology
1 answer:
ICE Princess25 [194]3 years ago
7 0

Answer:

it may be point or silent mutation,they're both kinda the same thing.

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Different ratios occur in crosses with single gene pairs or two gene pairs. What types of ratios are likely to occur in crosses
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Answer:

Genotype ratio: 1, 1:1, 1:2:1

Phenotype ratio: 1, 3:1

Explanation:

Single gene pair cross is also known as monohybrid cross. This means that only one gene usually with two alleles is observed and it express one trait.

For example, if we name the gene for a certain trait with A, the possible genotypes are AA (dominant homozygous), aa (recessive homozygous) and Aa (heterozygous). Possible crosses are:

P: AA  x  AA

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The same is with aa x aa (all of the offspring are with aa genotype)

P: AA  x  Aa

F1: AA Aa AA Aa  (genotype ratio 1:1) (phenotype ratio 3:1)

The same genotype ratio is  in aa x Aa (offspring will have aa Aa aa Aa-(genotype ratio 1:1) (phenotype ratio 1:1)

P: Aa x Aa

F1: AA Aa Aa aa (genotype ratio 1:2:1) (phenotype ratio 3:1)

P: AA x aa

F1: Aa Aa Aa Aa (1)

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What are loops within orbits?
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