An aquatic animal has the antennae that are either smooth or barbed. The allele for barbs is dominant. In the same organism, resistance to pesticides is a recessive trait. One animal that is resistant to pesticides and has a smooth antennae is crossed with one that is heterozygous for both traits.

1. Show the genotypes of the parents.

2. What’s are the genotype(s) of the offspring? What are their phenotypes?

3. What percentage of the offspring will have barbed antennae and resistant to pesticides?

4. What is the ratio of barbed to smooth antenna?

5. What is the ratio of resistant animals to non-resistant animals?

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mickymike92 mickymike92 · Answer 1 · 2022-04-27T14:56:09+02:00

The genotype and phenotype ratio of the offspring depends on the genotype of parents.

Alleles are alternative forms of a gene is trait.

Alleles may be dominant or recessive.

1. Let the alleles for barbed and smooth antennae be B and b respectively

Let the alleles for resistance and non-resistance to pesticides be p and P respectively.

. Genotype of parents are as follows:

2. The cross is as follows:

bbpp × BbPp = BbPp, Bbpp, bbPp, bbpp, BbPp, Bbpp, bbPp, bbpp, BbPp, Bbpp, bbPp, bbpp, BbPp, Bbpp, bbPp, bbpp.

Genotype of offspring is BbPp, bbPp and bbpp

Phenotype of offspring is;

3. There are 3 Bbpp offspring out of 16.

Percentage = 3/16

Percentage of the offspring that will have barbed antennae and resistant to pesticides = 19%

4. The ratio of barbed to smooth antennae is 1 : 1

5. The ratio of resistant animals to non-resistant animals is 1 : 1

Therefore, the genotype and phenotype ratio of the offspring depends on the genotype of parents.

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