In the fruit fly Drosophila, there is a dominant gene for normal wing shape and its recessive allele for dumpy wings. At another
gene locus on the same chromosome, there is a dominant gene for tan body color and its recessive allele for ebony body color. A male that is homozygous for both dominant alleles is crossed with a female that is homozygous for both recessive alleles. What percentage of the F1 flies are expected to be heterozygous at both gene loci? ( Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5 )
Genotype for the normal wing shape would be either AA or Aa and recessive genotype for dumpy wings would be aa. If we name the other gene for body color with B, then
genotype for tan body color would be BB or Bb and for ebony body color bb.
If we cross a male homozygous for both dominant alleles with a female homozygous for both recessive alleles:
P: AABB x aabb
F1: AaBb
All of the offspring would be heterozygous at both gene loci.
Answer: Both smallpox and COV 19 are novel diseases in their respective timelines. Both spread by inhaling infected droplets, albeit COV 19 is transmitted through aerosols and surfaces touched by infected people as well.
