Exam 13: Observing Patterns in Inherited Traits

In sweet peas, dominant allelesC and P are necessary for colored flowers. In the absence of either (__ pp or cc __) or both (cc pp), the flowers are white. Give the probable genotype of a plant with colored flowers and a plant with white flowers that produced 38 plants with colored flowers and 42 plants with white flowers.

In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of any color gene (C). The recessive allele (c) results in albinism when homozygous (cc). Give the F2 phenotypic ratio of a cross between a colored chicken (ii CC) with a white chicken (II cc).

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 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents?

In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ´ silver >>> all silver offspring; (2) silver ´ platinum >>> equal numbers of silver and platinum; (3) platinum ´ platinum >>> two platinum for each silver offspring. Explain.

A homozygous recessive where "A" represents the trait has two recessive alleles symbolized by __________.

The CFTR protein product is responsible for

In poultry, rose comb is controlled by a dominant allele, and its recessive allele controls single comb. (a)Give the genotype and phenotype produced from crossing a pure-breeding rose comb chicken with a pure-breeding single comb chicken. (b)Give the results of the backcross of the F1 hybrid with both pure-breeding parents.

If wire hair (W) is dominant to smooth hair (w), and you find a wire-haired puppy, how would you determine its genotype by a genetic breeding experiment?

Different molecular forms of the same gene are __________.

Explain what genetic 'trick' could have confounded Mendel is his recognition of segregation?

Heritable units of information about traits are called __________.

In a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers, only blue flowers are produced. Plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, although other times they produce either red or blue flowers. When plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. Which gene is dominant?​

White fruit color in summer squash is influenced by a dominant allele W, whereas colored fruit must be ww. In the presence of ww, a dominant gene G results in yellow fruit, and homozygous gg results in green fruit. Give the F2 phenotypic ratios resulting from a cross of a true-breeding plant with white fruit (genotype WW GG) with a plant with green fruit.

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 recessive for one gene and heterozygous for the other (aa Bb), how many unique phenotypes potentially will be present in their offspring?

A gene that produces multiple effects is called a(n)

In radishes, two incompletely dominant genes control color and shape. Red (R) is dominant over white (r), and heterozygotes are purple. Long (L) is dominant over round (l), and heterozygotes are oval. If a true-breeding red, long radish is crossed with a true-breeding white round radish, give the F2 genotypic and phenotypic ratios.

Figure 13.12 ​ -The F2 phenotypic ratio of 9:3:4, as shown above, is a result of a cross involving

Figure 13.17 -A graph of phenotypic variation similar to the accompanying illustration strongly suggests

Mendel's monohybrid experiment results led to his law of __________.

Figure 13.7 -Using the accompanying illustration and the assumption that half of a plant's sperm and eggs are p and half are P, one can predict that the chance of sperm p meeting egg P at fertilization is ____.