Exam 3: Transmission of Genes from Generation to Generation

Explain how the resulting phenotypic ratios from Mendel's dihybrid cross assisted him in framing his Second Law.

A locus is ____.

In codominant inheritance,____.

Explain the circumstances that led to a debate about whether all inheritance cases could be explained by Mendelian inheritance or whether there might be another,separate mechanism of inheritance that did not follow the laws of segregation and independent assortment.Summarize the outcome of that debate.

The topic of ____,the idea of the fundamental unit of living organisms,raised several questions in Mendel's mind about inheritance.

Pure-breeding individuals always have the ____________________ genotype.

In a cross between a true-breeding plant bearing the dominant traits of smooth,yellow seeds and a true-breeding plant bearing the recessive traits of wrinkled,green seeds,the offspring (F1)are all smooth and yellow and their genotype is ____.

Mendel chose to study pea plants because they have a long life cycle that offers ample time for analysis.

The inheritance of human traits is predictable because the genes controlling them exhibit the principles of both ____________________ and ____________________ during meiosis.

Identify the contribution of Walter Sutton and Theodore Boveri to the science of genetics and explain its importance.

The genotypes of two F1 plants are SsYy,with S and Y alleles dominant to s and y.If fertilization occurs at random ____________________ (number)genotypes and ____________________ (number)phenotypes will result in the F2 generation.

Alternate forms of a gene are called ____.

When members of the gene pair carried by an individual are not alike,the individual is said to be ____________________.

If a dihybrid cross is begun with a P1 generation of a true-breeding plant that produces smooth and yellow peas (smooth and yellow are both dominant traits),crossed with a plant that produces wrinkled green peas (wrinkled and green are both recessive traits),the F1 plants will all be smooth and yellow.

Mendel analyzed his pea plant data using the principles of ____.

In a P1 cross involving incomplete dominance,____.

Recessive traits are expressed only in the homozygous state.

Figure -Interpret the pedigree in the accompanying figure by describing each symbol and number.How might the information from this pedigree be used by clinicians and researchers?

Independent assortment means that the ____.

Explain why Mendel choose seven different varieties of pea plants for his experiments.