Mendel was a careful researcher who studied the inheritance of certain traits in garden peas. Which research practices did Mendel not use?

The Punnett square shown below describes a cross between two pea plants. The letter T represents the dominant allele for tall plant height, and the letter t represents the recessive allele for short plant height.

What were the genotypes of the parents that produced the offspring in the Punnett square?

Study the Punnett square shown here. It describes the potential offspring of a cross between two parents.

What phenotypes will be shown by the offspring?

Which two genes are most likely to be affected by a crossing-over event?

These homologous chromosomes carry different alleles of the wild type and mutant type in the fruit fly Drosophila.

A cell with the homologous chromosomes undergoes meiosis, and gametes are produced. Is it possible for a chromosome of a gamete to contain the alleles for gray body and brown eyes?

Meiosis is a process that ____________ chromosomes to the haploid number, provides genetic variation, and ensures the correct distribution of chromosomes into the gametes.

Meiosis is a process that reduces chromosomes to the ___________ number, provides genetic variation, and ensures the correct distribution of chromosomes into the gametes.

Meiosis is a process that reduces chromosomes to the haploid number, provides genetic _________, and ensures the correct distribution of chromosomes into the gametes.

Meiosis is a process that reduces chromosomes to the haploid number, provides genetic variation, and ensures the correct distribution of _________ into the gametes.

Meiosis is a process that reduces chromosomes to the haploid number, provides genetic variation, and ensures the correct distribution of chromosomes into the ___________.

A human cell that carries a double set of chromosomes is called a _____________ cell. The cell contains 2N = 46, number of chromosomes. One allele of each gene is located on each homologous chromosome. In sexual reproduction, meiosis produces haploid gametes with one of each kind of chromosome. In humans, these cells contain N = 23 number of chromosomes.

A human cell that carries a double set of chromosomes is called a diploid cell. The cell contains 2N = 46, number of chromosomes. One __________of each gene is located on each homologous chromosome. In sexual reproduction, meiosis produces haploid gametes with one of each kind of chromosome. In humans, these cells contain N = 23 number of chromosomes.

A human cell that carries a double set of chromosomes is called a diploid cell. The cell contains 2N = 46, number of chromosomes. One allele of each _____________ is located on each homologous chromosome. In sexual reproduction, meiosis produces haploid gametes with one of each kind of chromosome. In humans, these cells contain N = 23 number of chromosomes.

A human cell that carries a double set of chromosomes is called a diploid cell. The cell contains 2N = 46, number of chromosomes. One allele of each gene is located on each _____________ chromosome. In sexual reproduction, meiosis produces haploid gametes with one of each kind of chromosome. In humans, these cells contain N = 23 number of chromosomes.

A human cell that carries a double set of chromosomes is called a diploid cell. The cell contains 2N = 46, number of chromosomes. One allele of each gene is located on each homologous chromosome. In sexual reproduction, meiosis produces _____________ gametes with one of each kind of chromosome. In humans, these cells contain N = 23 number of chromosomes.

A human cell that carries a double set of chromosomes is called a diploid cell. The cell contains 2N = 46, number of chromosomes. One allele of each gene is located on each homologous chromosome. In sexual reproduction, meiosis produces haploid gametes with one of each kind of chromosome. In humans, these cells contain N = _______ number of chromosomes.

A yellow seeded, purple flowered heterozygous plant (YyPp) is crossed with a green seeded, white flower plant (yypp). (Y = yellow seed allele; y = green seed allele; P = purple flower allele; p = white flower allele)

What is the probability that an offspring of this cross produces plants with green seeds and white flowers? Assume the traits assort independently.

How many different gametes can be produced by a tall, yellow-seeded, purple- flowered, and wrinkled-seeded pea plant? The genotype of the pea plant is TtYyPprr.

What happens to the two cells formed at the end of meiosis I?

Which event occurs in prophase I of meiosis, but not prophase of mitosis?

A plant’s stem length distribution was graphed from the F₁ generation of a cross. Seven categories of stem length phenotypes were observed.

What pattern of inheritance is suggested by the graph?

Red blood cells carry antigens on their surfaces coded for by alleles of the gene represented by the letter I. The allele I^A is dominant to i and produces antigen A on the surface of red blood cells. The allele I^B is also dominant to the i allele and produces antigen B on the surface of red blood cells. The i allele does not produce surface antigens.

What are the possible genotypes of a person with type A blood?

I. I^AI^A

II. I^AI^B

III. I^Ai

What type of pattern of inheritance is represented by the genetics of human blood types?

A. I^A and I^B show incomplete dominance because both alleles are partially expressed in blood type A and B.

B. The human blood types are an example of polygenic traits with four possible phenotypes: A, B, AB, O.

C. I^A and I^B show codominance because both alleles are equally expressed in blood type AB.

D. The human blood type gene is an example of a gene with multiple alleles: I^A, I^B, i.

Coat color in rabbits is inherited by multiple alleles for a single gene. The table describes the genes and their inheritance.

Would it be possible to obtain a rabbit with Chinchilla coat color if one parent is white and the other parent has a Himalayan coat color?

Mitochondria are often described as the powerhouses of the cell. Genetic disorders can occur when mitochondrial mutations occur. For example, a condition called Kearns-Sayre syndrome is caused by deletions in the mitochondrial DNA. This genetic disorder causes weakness of the muscles and other symptoms because the mitochondria are not able to provide sufficient energy to the cells.

The diagram shows possible phenotypes of children with an affected parent, or parent who has the diseases.

How is Kearns-Sayre disorder inherited? Select the best explanation.

In order to fly effectively, the body temperature of the Western white butterfly needs to be 28-40^oC. more pigmentation allows a butterfly to reach the warm body temperature faster. In hot summer months, less pigmentation prevents the butterflies from overheating. In this case, environmental conditions affect the phenotype and influence ____________ of the butterfly.

In order to fly effectively, the body temperature of the Western white butterfly needs to be 28-40^oC. _________pigmentation allows a butterfly to reach the warm body temperature faster. In hot summer months, less pigmentation prevents the butterflies from overheating. In this case, environmental conditions affect the phenotype and influence genetically determined traits of the butterfly.

In order to fly effectively, the body temperature of the Western white butterfly needs to be 28-40^oC. more pigmentation allows a butterfly to reach the warm body temperature faster. In hot summer months, ________ pigmentation prevents the butterflies from overheating. In this case, environmental conditions affect the phenotype and influence genetically determined traits of the butterfly.

In order to fly effectively, the body temperature of the Western white butterfly needs to be 28-40^oC. more pigmentation allows a butterfly to reach the warm body temperature faster. In hot summer months, less pigmentation prevents the butterflies from overheating. In this case, _____________ conditions affect the phenotype and influence genetically determined traits of the butterfly.

In order to fly effectively, the body temperature of the Western white butterfly needs to be 28-40^oC. more pigmentation allows a butterfly to reach the warm body temperature faster. In hot summer months, less pigmentation prevents the butterflies from overheating. In this case, environmental conditions affect the _____________ and influence genetically determined traits of the butterfly.

In cattle, if a red cow is crossed with a white bull, a mixture of red and white color, called roan, is produced in the F₁ generation. Crosses between animals in the F₁ generation produce white, roan, and red cattle in the F₂ generation.

What is the pattern of inheritance in these types of cattle?

In cattle, if a red cow is crossed with a white bull, a mixture of red and white color, called roan, is produced in the F₁ generation. Crosses between animals in the F₁ generation produce white, roan, and red cattle in the F₂ generation.

What is the ratio of the expected offspring in the F₂ generation?

A gardener crosses a true-breeding tall tomato plant bearing red fruit with a true-breeding dwarf tomato plant with yellow fruit. In tomatoes, tall vine (T) is dominant to dwarf vine (t), and red fruit (R) is dominant to yellow fruit (r). The results are labeled the F₁ generation. Then the gardener allows F₁ plants to reproduce by self-pollination, generating the F₂ generation.

The Punnett square shows the predicted results of the F₂ generation. Some of the entries in the Punnett square are missing.

Which is the LEAST common phenotype in the F₂ generation?

A gardener crosses a true-breeding tall tomato plant bearing red fruit with a true-breeding dwarf tomato plant with yellow fruit. In tomatoes, tall vine (T) is dominant to dwarf vine (t), and red fruit (R) is dominant to yellow fruit (r). The results are labeled the F₁ generation. Then the gardener allows F₁ plants to reproduce by self-pollination, generating the F₂ generation.

The Punnett square shows the predicted results of the F₂ generation. Some of the entries in the Punnett square are missing.

What are the expected phenotype ratios in the F₂ generation?

One dog is heterozygous for black fur (Bb), and its mate is homozygous for blonde fur (bb). The Punnett square describes a cross between the two dogs.

What is the expected outcome of the cross?

One dog is heterozygous for black fur (Bb), and its mate is homozygous for blonde fur (bb). The Punnett square describes a cross between the two dogs.

The first litter of the two dogs produces 3 puppies that each had black fur. If the dogs have a second litter, what is the probability of one of the puppies having black fur?