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The fraction of the offspring will be homozygous for all dominant alleles is 1/128. A homozygous dominant allele combination contains two dominant alleles and expresses the dominant phenotype (expressed physical trait). A homozygous recessive allele combination contains two recessive alleles and expresses the recessive phenotype.
In this genetic cross, all of the offspring will be homozygous for all dominant alleles because the parents are homozygous for the alleles. To understand this, we need to review the principles of Mendelian genetics.
Mendelian genetics is the study of inheritance patterns of genes, which are units of genetic information that are passed from parent to offspring. Genes can be either dominant or recessive. Dominant genes are expressed when only one copy is present, while recessive genes require two copies to be expressed. In this case, all of the alleles are dominant, so it does not matter whether a single copy or two copies are present.
In this particular cross, the parents are homozygous for the alleles, meaning that they possess two copies of the same allele. This means that all of the offspring will also be homozygous for the alleles because they will inherit two copies of the same allele from each parent. Therefore, the fraction of offspring that will be homozygous for all dominant alleles will be 100%.
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