Exam 13: Observing Patterns in Inherited Traits

Matching Answer the following questions using the group of answers below. -In a dihybrid cross between a parent that is a double heterozygote (Aa Bb) and a parent that is homozygous dominant for one gene and heterozygous for the other (AA Bb), how many unique genotypes potentially will be present in their offspring?

Tall (D) is dominant to dwarf (d). If a true-breeding tall plant is crossed with a true-breeding dwarf plant, give the genotypic and phenotypic ratios of the F2generation.

The role of environmental factors on gene expression is illustrated by ____.

__________ refers to an individual's observable traits.

A cross of two Kerry horses always produces Kerry offspring. A cross of a Kerry with a Dexter produces 1/2 Kerry and 1/2 Dexter offspring. Crosses of two Dexters produce two Dexters for every Kerry. Explain.

Which is easier to establish in a pure-breeding population, a dominant or a recessive gene?

The ability of rats to cope with stress as adults can be affected by ____.

An individual with a genetic makeup of aa BB is called

The most accurate description of an organism with genotype AaBb is

For Mendel's explanation of inheritance to be correct, ____.

In humans, the locus of the CFTR gene is on chromosome ____.

If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:​ (a)2 spot × 2 spot yields 2 spot and 4 spot?(b)2 spot × 4 spot yields only 2 spot?(c)2 spot × 4 spot yields 2 spot and 4 spot?(d)2 spot × 2 spot yields only 2 spot?(e)4 spot × 4 spot yields only 4 spot

In the classic argument of 'nature vs. nurture', nature would most correspond with

In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black (BB), when crossed with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a true-breeding black with a single comb and a true-breeding splashed-white with a rose comb.

Answer the following questions using the group of answers below. -Animal species X is tetraploid (4n = 12). Following gene duplication and translocation, a given gene is found on each chromosome. How many alleles for this gene can be present in an individual of this species?

According to Mendel, if a male that is homozygous for the dominant form (PP) of a trait is crossed with a female that is homozygous for the recessive (pp) form of a trait, all offspring will show the ____ form of the trait.

In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with white flowers crossed with a dwarf plant with purple flowers produces all tall offspring with purple flowers. What is the genotype of the parents?

In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t). Give the genotype and phenotype of the horse you would use in a testcross to determine the genotype of a black trotter.

Where is the CFTR gene expressed at the highest levels?

Mendel's dihybrid crosses, but not his monohybrid crosses, show that