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Gelneren [198K]
3 years ago
14

Which biome has permafrost

Biology
2 answers:
siniylev [52]3 years ago
8 0
The tundra biome has permafrost
Nadya [2.5K]3 years ago
4 0
The tundra biome has permafrost
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In ducks, the trait for normal feathers is dominant to the trait for silky feathers. If
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Answer: The genotype ratio is 2Ff : 2ff

The phenotype ratio is two normal feathered birds to two silky feathered birds.

Explanation: Let F represent the gene for normal feather and f represent the gene for silky feather. F is dominant while f is recessive, therefore a male that is hybrid for trait of normal feather is heterozygous and will have a genotype of Ff, a female that is homozygous for silky feather will have a genotype of ff.

A cross between Ff and ff will yield 2Ff birds and 2ff birds. Since F is dominant, a bird having genotype of Ff will manifest outwardly as blue feathered birds while ff will manifest outwardly as silky feathered birds because f is recessive and must occur in a homozygous condition in order to manifest phenotypically. Therefore, the genotype ratio is 2Ff: 2ff.

See the punnett square attached for more information

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