Two individuals with dominant phenotypes never produce true-breeding progeny wit

Question

Two individuals with dominant phenotypes never produce true-breeding progeny with a dominant phenotype and the proportion of dominant and recessive phenotypes in the progeny is always 2/3 dominant and 1/3 recessive. Which of the following is the most likely explanation of this scenario? one dominant parent is homozygous dominant and one is heterozygous the homozygous dominant genotype is lethal the homozygous recessive genotype is lethal the trait is sex influenced the trait exhibits genomic imprinting If 2 genes are linked but not completely, then we should observe which of the following when an individual who is heterozygous at both loci is crossed in a test cross? all non-recombinant progeny mostly recombinant and fewer non-recombinant progeny all recombinant progeny mostly non-recombinant and fewer recombinant progeny there is not enough information to make any of these conclusions

Explanation / Answer

Answer:

27). B. Homozygous dominant genotype is lethal

Homozygous dominant genotype is lethal. So immediately after formation of zygote from both dominant genes, the zygote will die.

28). D. Mostly non-recombinant and fewer recombinant progeny.

Due to linkage more parental (non-recombinant) and less recombinant progeny will be produced.

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