BJ27

There are white-eyed females in the F2 generationbecause

(D) these F2 females have two white alleles

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The fertilization of ovules from Plant Q by pollen from Plant R results in the production of seeds. What percent of the genes in each offspring's chloroplasts will have been inherited from plant R?

0%

Which of the following is the mean number per cross of F2 generation offspring that are the result of crossing over?

2.2

In sheep, eye color is controlled by a single gene with two alleles. when a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. if the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes?

25%

Which of the following critical values should the scientist use for the chi-square analysis of the data?

3.84

Pigeons demonstrate ZW sex determination, such that a ZZ genotype produces a male and a ZW genotype produces a female. The gene for feather color is located on the Z chromosome, and the red allele is dominant over the brown allele. Three crosses between brown male pigeons and red female pigeons were performed, and the results are shown below.Which of the following is the mean number of male offspring produced by the three crosses?

9

The pedigree suggest that the gene is on a nuclear chromosome, and not on a mitochondrial DNA, because

C; maternal mitochondrial mutations are inherited by all of a mother's offspring

Gregor Mendel's pioneering genetic experiments with pea plants occurred before the discovery of the structure and function of chromosomes. Which observation about inheritance in pea plants could be explained only after the discovery that genes may be linked on a chromosome? (Genetics)

Most offspring of a given cross have a combination of given traits that is identical to that of either one parent or the other

Eye pigment in a particular strain of fly is determined by two genes. An autosomal gene that controls the color of the pigments in the eye has two alleles: a dominant allele (R) that results in red eyes and a recessive allele (r) that results in sepia eyes. A sex-linked gene that controls the expression of the colored pigments also has two alleles: a dominant allele (T) that allows for expression of the colored pigments and a recessive allele (t) that does not allow for it. Individuals without a T allele have white eyes regardless of the alleles of other eye-color genes. Which of the following represents a cross b/w a whote-eyed female and a red-eyed male?

RrX^tX^t x RrX^TY

In humans, red-green color blindness is a sex-linked recessive trait. If a man and a woman produce a color-blind son, which of the following must be true?

The mother carries the allele for color blindness.

Figure 1 shows the inhertence of a particular genetic condition in three generations of one family. Which of the following best explains the observed pattern of inheretence ?

the condition is passed from mothers to offspring via a mitochondrial gene

which of the following provides the best justification for an assumption that might have been used in the computer simulation Table 2

the purple allele is dominant to the white allele because all the offspring from the cross of purple-flowered and white-flowered plants had purple flowers.

In the F2 generation, the results are best explained by the fact that

these genes for eye color and wing shape are found on the same chromosome

Which of the following best describes the mode of inheritance of eye color in the white culture?

D sex linked

The data above represent the results of three different crosses involving the inheritance of a gene that determines whether a certain organism is blue or white. Which of the following best explains the mechanism of inheritance of the gene?

D- The allele for blue is an x-linked dominant allele because there are no blue male offspring in cross 2

The tiny blue-eyed mary flower is often one of the first flowers seen in some regions of the United States. Which of the following statements best explains the data?

D-flower color is an inherited trait.

The tiny blue-eyed Mary flower is often one of the first flowers seen in the spring in some regions of the US... Which of the following statements best explains the data?

Flower color is an inherited trait

A student in a biology class crossed a male Drosophila melanogaster having a gray body and long wings with a female D. melanogaster having a black body and apterous wings. The following distribution of traits was observed in the offspring:Phenotype:Number of Offspring-Gray body, long wings: 42Black body, apterous wings: 41Gray body, apterous wings: 9Black body, long wings: 8Which of the following is supported by the data?

Genes for the two traits are located close together on the same chromosome and crossing over occurred between the two gene loci

Which of the following best describes the genotype of the individual identified with an asterisk in the pedigree in figure one

One dominant alas two allele and one recessive alas two allele

In table II, the F1 offspring of the cross between broad=leaved, white-flowered plants with narrow-leaved, purple-flowered plants have a phenotype that differs from either parent. However, many test cross offspring have the same phenotype as one of the two plants in the parental cross, but relatively few test cross offspring have the same phenotype as the F1 offspring. which of the following best explains the observation?

Recombination between the leaf shape and flower color genes resulted in chromosomes carrying a dominant allele of both genes

The student calculates a chi-square value of 0.36. Which of the following statements best completes the student's chi-square goodness-of-fit test?

The critical value is 3.84, and the student cannot reject the null hypothesis.

In the cross diagrammed above, the expected and observed results are shown. Which of the following best explains the observed results of the cross?

The genes for body color and wing shape are located close to each other on the same chromosome.

The students calculate a chi-squared value of 92.86 and compare it with a critical value of 7.82. Which of the following best completes the chi-square goodness-of-fit test?

The null hypothesis can be rejected, and the students should conclude that the data may have resulted from genetic linkage.

The researchers calculate a chi-square value of 4.6 and choose a significance level of p=0.05. Which of the following statements best completes the chi-square goodness-of-fit test?

The null hypothesis cannot be rejected because the chi-square value is less than the critical value.

A researcher observed that when two heterozygous plants with red flowers are crossed the resulting offspring include plants with red white or pink flower. The researcher proposes the null hypothesis that flower color is the result of independent assortment and incomplete dominance. The researcher calculates a chi square value of 7.3. Assuming two degrees of freedom which of the following is the correct interpretation of the chi square analysis using a p value of 0.05?

The null hypothesis should be rejected because the critical value is less than the calculated Value

In order to determine the effects of age on the accumulation of mitochondrial mutations, mitochondrial DNA samples from young mice (3 months) and old mice (30 months) were observed for mutations.Which of the following is a correct analysis of this data set?

There is an increase in the mean number of mutations for the two age groups of 9.2 mutations per 106106 base pairs. This is more critical in female mammals since mitochondria are maternally inherited.

A male fruit fly (Drosophila melanogaster) with red eyes and long wings was mated with a female with purple eyes and vestigial wings. All of the offspring in the F1 generation had red eyes and long wings.These F1 flies were test crossed with purple-eyed vestigial-winged flies. Their offspring, the F2 generation, appeared as indicated below.F2 Generation125 red eyes, long wings124 purple eyes, vestigial wings18 purple eyes, long wings16 red eyes, vestigial wings283 total106. If in the F1 and F2 generations the same characteristics appeared in both males and females, it would be safe to assume that these traits for eye color and wing length

are autosomal characteristics

In the pedigree above, circles represent females, squares represent males, and shaded figures represent individuals expressing a trait. The expression of this trait is most likely which of the following?

automsomal recessive inheritance

The relative location of four genes on a chromosome can be mapped from the following data on crossover frequenciesGenes Frequency of CrossoverB and D 5%C and A 15%A and B 30%C and B 45%C and D 50%Which of the following represents the relative positions of these four genes on the chromosome:

c) CABD

A series of crosses is performed with fruit flies (Drosophila melanogaster) to examine inheritance of the genes vestigial (vg) and cinnabar (cn). The recessive vg allele causes small, malformed wings called vestigial wings. The recessive cn allele causes bright-red eyes called cinnabar eyes. In the first cross, a female with wild-type wings and eyes. In the second cross, female F1 flies are mated with males with vestigial wings and cinnabar eyes. The phenotypes of F2 individuals are shown in the table. Which of the following is the most likely explanation of the results?

the two genes are linked on an autosome