Consider a gene with two alleles, G and g, and heterozygote superiority. Which statement about the fitness of each genotype is correct? A. The fitnesses of the three genotypes would be the same B. The fitness of gg would be greater than that of wither Gg or GG C. There is not enough information to tell D. The fitness of GG would be greater than that of either Gg or gg E. The fitness of Gg would be greater than that of wither gg or GG

When comparing asthma and cystic fibrosis, the proportion of variance in each illness that can be explained by genetic factors: a. Is different for different populations b. is highest in cystic fibrosis c. is the same for both illnesses Od. Is highest in asthma

When the phenotype of the offspring is determined by environmental effects only…   a. it is due to epistasis   b. it is a genotype-by-environment effect   c. it is maternal inheritance   d. a non-additive genetic effect   e. it has a narrow sense heritability of zero.

This problem will explore a concept called epistasis.  Epistasis occurs when one set of alleles can mask the presence of a different set of alleles. In humans, normal pigmentation (A) dominates no pigmentation (albino = aa). Black hair (B) dominates blonde hair (b). An albino person will have white hair even though he or she may also have the alleles for black or blonde hair. An albino male who is homozygous for black hair marries a woman who is heterozygous for normal pigmentation and has blonde hair.  What colors of hair can their children have, and what is the probability for each hair color? Two people with normal pigmentation have one child with dark hair, two children with light hair, and two albino children.  What are the possible genotypes for the parents?  If you are not certain about an individual’s allele, indicate this with a blank ( __ ).

Due to dosage compensation by X inactivation, females can exhibit a mosaic pattern of sweat glands on only some portions of their body if they carry a particular loss of function allele. Could any of the following genotypes result in males with such a mosaic pattern of sweat glands? Explain. A. X^AY B. X^AX^AY C. X^AX^aY D. Not possible

Define epistasis? a. Allelic variation at two different genes adds together in order to produce a phenotypic outcome b. Genetic variation and environmental variation both affect a given phenotype c. Allelic variation at one gene prevents or conceals the phenotypic consequences of allelic variation at a different gene d. Allelic variation at single gene affects many different phenotypes e. Genes that are near the start of a gene cluster are expressed before genes near the end of the cluster

In a hypothetical population, matings involving two individuals heterozygous for the phenylketonuria allele on chromosome 12 result in 10% of the offspring showing the effects of the disease. This percentage arises because:   A. the trait has pleiotropic effect   B. the trait assorts independently   C. the trait has low expressivity   D. the trait has only partial penetrance   E.  the trait is sex-influenced

What does a Punnett square tell you?   a.The inheritance pattern for a pair of alleles   b.The phenotype probabilities of offspring for a given cross   c.The number of offspring who will have a particular genotype for a given cross   d.The genotype probabilities of offspring for a given cross 2.What would be the most likely karyotype for somebody described as “hemizygous positive for a Y-linked trait”?   a.Y+ Y+   b.X Y+   c.X+ Y+   d.X+ Y- 3.X-linked ichthyosis is an X-linked recessive trait that manifests in part as dry, scaly skin (“ichthy-” = fish or fish like). Suppose a couple are considering having a child together. Parent A is heterozygous for the ichthyosis allele while Parent B is hemizygous negative for the ichthyosis allele. What is the probability their child would be unafflicted with ichthyosis but be a carrier of the ichthyosis-causing allele?   a.0%   b.25%   c.50%   d.75%   e.100% 4.If somebody has the phenotype of…

In your own words, define each term below and give an example of the concept. a. gene b. allele c. genotype d. phenotype e. heterozygous f. homozygous g. dominant h. recessive i. codominance j. incomplete dominance Pre-Lab | Mend