Assume that children are born to a female with Down syndrome and a normal male. What proportion of the offspring would be expected to have Down syndrome?   One-third of the offspring would be expected to have Down syndrome. One-half of the offspring would be expected to have Down syndrome. All the children would be expected to have Down syndrome. Two-thirds of the offspring would be expected to have Down syndrome. None of the offspring would be expected to have Down syndrome.

The gene for black hair (B) is dominant over the recessive gene for blond hair (b). If the father is heterozygous for black hair (Bb) and the mother has blond hair (bb), what is the likelihood that their child will have blond hair? 50% 75% 25% 100%

What are the two alleles for somebody who Marfan syndrome, a dominant disease? What allele would be the healthy allele, and which one would be the allele for Marfan syndrome?

In dogs, the color black is dependent upon the dominant allele B and white upon the recessive allele b. If two heterozygous black dogs mate, what genotypes and phenotypes may show up in the F1 generation?   QUESTION: What percent of the offspring would you expect to have: A black phenotype and a white phenotype?

Given that there is a trait determined by the alleles A and a, where A is dominant, i.e., the presence of A determines the phenotype.  Assume that two parents have four children, and assume that nothing is known about the parents.  One of the four children shows the recessive condition (so its genotype is aa) and the other three show the dominant trait (so their genotype is either Aa or AA).   What can we conclude about the parents? Group of answer choices - at least one parent shows the dominant trait - Both parents are heterozygous - Both parents have at least one recessive allele

In humans, the gene for right-handedness is dominant to the gene for left-handedness. A man and a woman both heterozygous for this trait marry. What percent of their children can they expect to be right-handed? What percent left-handed? What are the genotypic and phenotypic ratios?

The gene for eye color has several alleles. The allele for brown eyes is symbolized with B and the allele for blue eyes is symbolized with b. A father has the phenotype of blue eyes (recessive trait) and a mother has a phenotype of brown eyes (dominant trait.). If they have a child, what is the most likely genotype?     Bb     bb     BB     none of these

A WOMAN IS HETEROZYGOUS FOR A TRAIT CAUSED BY A DOMINANT ALLELE THAT SHOWS 75% PENETRANCE. HER PARTNER IS UNAFFECTED. WHAT IS THE PROBABILITY THAT, IF SHE HAS A CHILD, IT WILL BE AFFECTED? (HINT: WHAT'S THE CHANCE SHE WILL PASS THE ALLELE ON TO HER CHILD AND THAT THE CHILD WILL SHOW THE TRAIT?)

In humans, free ear lobes (E) is dominant over attached ear lobes (e), and brown eyes (B) is dominantover blue eyes (b). A man with free ear lobes and brown eyes marries a woman with attached ear lobes andbrown eyes. Of four children, one has free ear lobes and brown eyes, one has free ear lobes and blue eyes,one has attached ear lobes and brown eyes, and one has attached ear lobes and blue eyes. Determine thegenotypes of the parents.

Compare and contrast the following types of inheritance by describing and explaining each: incomplete dominance co-dominance sex-linked inheritance