Freckles are small, spots of a skin pigment called melanin. most fair-skinned, red-haired people have them. freckles are controlled primarily by the mc1r gene. freckles are a dominant trait: parents who have freckles tend to have children with freckles. bill and barb both have freckles. yet of their four children, one child does not have freckles! what must be the genotypes of bill and barb? a) bb and bb b) bb and bb c) bb and bb d) bb and bb

As a small change in a person's dna can cause a genetic disorder

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit

Use the above pedigree for questions 1,2, and 3 1. what kind of genetic disorder is represented in the pedigree? a. recessive b. dominate refer to the pedigree in question 1. 2. is the mutated gene in this disorder located on a sex chromosome (x or y) or an autosome? a. sex chromosome b. autosome refer to the pedigree in question 1. 3. which generation has individuals that you are certain are heterozygous for the mutated gene? a. generation 1 b. generation 2 c. generation 3