Exam 5: The Inheritance of Single Gene Traits

The genotype of an organism with a dominant phenotype but unknown genotype can be inferred using a test cross. What genotype should a plant A_ be crossed to in a test cross?

The physical outcome - or trait - that results from gene expression is a genotype.

Fill in the gaps in the Punnett square. [] [] tall [] [] short

What is the probability that offspring ? is affected?

This question relates to Mendel's breeding experiments with peas. A true breeding plant producing smooth peas was crossed with a true-breeding plant producing wrinkled peas (cross 1). The offspring of cross 1 all produced smooth peas. The offspring of cross 1 were then crossed with the wrinkled-pea parent (cross 2). Which of the statements about the cross outcomes are true? Please select all that apply.

Match the genetic notations to their definitions. -wild-type allele

Mendel's Law of Segregation refers to the fact that the two alleles for a gene in a diploid organism separate during gamete formation and each gamete receives only one of these alleles.

A cross between Aa and aa produced four offspring. What is the chance that at least one of the offspring had the recessive phenotype?

How many offspring plants from a cross between R_ (round peas) and rr (wrinkled peas) genotypes would need to be examined to be confident at the 1% level that the R_ plant is actually RR?

This question relates to Mendel's breeding experiments with peas. Mendel crossed a true-breeding smooth pea plant with a true-breeding wrinkled pea plant. Mendel then crossed the offspring to each other. Which statements are true about the offspring of the second cross? Please select all that apply.

In a cross between two heterozygotes, the ratio of genotypes is the same as the ratio of genotypes

A tall plant with purple flowers with genotype TtPp was self-fertilized. There were 8 offspring. What is the chance that at least one of the plants was short?

Match the genetic notations to their definitions. -dominant allele

Match the genetic notations to their definitions. -strains used to initiate a mating experiment

Fill in the blank. Ploidy refers to the number of sets of chromosomes found in an organism. Most multicellular organisms are _____

Which characteristics are true of complex traits? Please select all that apply.

Match the letter to the correct description in the pedigree

What term is used for a variety that passes a trait onto all its offspring when crossed to a similar variety?

What term describes a situation where two functional alleles are required for proper biological function

Match the missing words in the following phrase. In a breeding experiment, a plant with alleles [A] produced white flowers. A plant with alleles a2/a2 produced purple flowers. A cross between these plants produced white flowers with genotype [B]. Therefore, allele a1 was [C] and allele a2 was [D].