Bio Topic 4.1b Eval – Genetics

Which statement best describes the relationship between an allele and a gene?  Use the following example to help you answer the question.

Which condition would most likely result in an increase in the phenotypic variation within a population?  Phenotypic variation means physical differences.

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

G = green, g = yellow
The genotype for a yellow plant is…

In 1917 the biologist Thomas Hunt Morgan conducted studies in which he kept some caterpillars in the dark and placed some others under red, green, or blue lights.  Exposure to red light produced butterflies with brightly colored wings.  Exposure to green light resulted in dark-colored wings.  Exposure to blue light or no light resulted in pale-colored wings.  What was the most likely conclusion of Morgan’s research?

At birth Himalyan rabbits are usually white over their entire bodies.  But when parts of their bodies reach temperatures below 20 degrees Celsius, a pigment that causes these parts to turn black is produced.  Which of the following is most likely the cause of this phenomenon?

How many alleles (letters) does a child get from each parent for each trait?

In a Punnett square each box represents a(n)….

            chromosomes are in a body cell and              chromosomes are in a sex cell.

The passing of physical characteristics from parent to offspring is __________.

A scientist observes that a certain trait is determined by a single allele.  An organism inherited one version of the trait from one parent and another version from the other parent.  Both versions of the trait are expressed in the phenotype of the offspring. Which pattern of inheritance best classifies the observed trait?

Six puppies from a single litter have the following genotypes for a certain trait:  AA, Aa, AA, aa, aa, Aa.  Which of the following describes how these alleles were passed on from parent to offspring?