BIO5-CHP6

If the height of pea plants is controlled by a single gene, where the tall allele, T, is dominant to the short allele, t, how many different possible phenotypes of height would exist in total?

2

A female fern plant is heterozygous for a gene related to photosynthesis (Pp). Select all of the different possible genotypes that her eggs could possess.

Eggs are haploid and cannot possess two copies of any allele. (only P or p)

Mendel understood that genetic information was carried on material elements within the cell.

F

When a gene possesses both dominant and recessive alleles, there are usually more possible phenotypes than genotypes.

F

In one experiment, Mendel crossed pea plants with purple flowers and pea plants with white flowers. The offspring of this cross all had purple flowers. Which statement best explains this pattern?

If one of the parents is homozygous dominant for a trait, all of the offspring from that parent will display the dominant phenotype, regardless of genotype of the mate. -The purple flowered parent plants were homozygous dominant.

A single gene trait with two alleles that show incomplete dominance should possess the same number of possible genotypes and phenotypes.

T

Tt

The tall parent must be Tt if it produces both tall and short offspring with a tt plant.

Gregor Mendel's contributions to our understanding of genetics.

While studying the outcomes of reproduction in pea plants, Gregor Mendel found that each individual carries [two] copy/copies of the allele for each trait and that [one] is/are passed on to each offspring. When studying inheritance of two different traits, Mendel found that the patterns of inheritance of one trait [has no effect on] the patterns of inheritance of another trait. This concept is now called the [law of independent assortment].

epistasis

a state where the phenotypic expression of one allele is dependent upon the presence of an allele for a different gene.

Aarr × AARR

can produce an AARr &AaRr offspring.

What is something that represents recessive traits?

genotype: a trait is the genetic makeup of the trait.

Environmental effects, such as lifestyle choices

make the patterns of inheritance complex.

If identical twins are genetically identical but do not share a trait

the environment must be playing a role in the expression of that trait.