If fur colour in mice is caused by the following: B = black and b = brown, choose the genotype for the organism which will have brown fur.

What is the name for the diagram one draws in genetics problems to determine the types of offspring produced by crossing two parents?

Down syndrome (trisomy 21) is a genetic disorder in which the afflicted individual

Assume that in mice, B = black fur, b = brown fur. If a heterozygous black mouse mates with a homozygous brown mouse, what per cent of their offspring will have black fur?

If Mendel had chosen more than seven traits in his plants, he might have run into some confusing results regarding

A codominance cross between a homozygous red and a homozygous white snapdragons produces

In Mendel's garden peas, the tall allele (D) is dominant over the dwarf allele (d) and the green pod allele is dominant (Y) over the yellow pod allele (y). What is the genotype of a heterozygous tall,homozygous green pod pea plant?

In Mendel's garden peas, the tall allele (D) is dominant over the dwarf allele (d) and the pod colour allele (Y) is dominant over the yellow pod (y). What is the genotype of a heterozygous tall,heterozygous green pod pea plant?

A recessive gene can be expressed if the genotype is

A chestnut coloured horse crossed with a white coloured horse results in a palomino coat colour. This is an example of ......... inheritance.

Why was Mendel fairly certain that he had a pure-bred variety when he collected seeds from a pea plant?

If an organism with the genotype Ww is crossed with a Ww organism, what would be the proportion of offspring that would be heterozygous?

If genes are not linked, a genotype of PpRr can produce ......... different kinds of gametes

In humans, brown eyes (B) is dominant over blue eyes (b). A brown-eyed man marries a blue-eyed woman. The possible eye colours of their children would be

Mendel's law of segregation states that

If an individual has a recessive phenotype for a given trait, the genotype must be

What would be the genotype of a plant that was homozygous for the dominant trait of axial flowers?

What is the phenotypic ratio of the cross homozygous dominant X homozygous dominant?

How many different genotypes are possible from a cross between the parents RR and rr?

What would be the phenotype of a pea plant of genotype Tt, where T is the allele for tall and t is the allele for short?

What would the parent's genotypes be if both were heterozygous for flower colour? (purple-W, white-w)

What would be the genotype of a pea plant of genotype Tt, where T is the allele for tall and t is the allele for short?

One reason for Mendel's success was that...

What would the parent's genotypes be if both were heterozygous for flower colour? (purple-W, white-w)

What phenotypes are possible from the cross, round seeded plant X wrinkled seeded plats?

Which of the following gives the correct order of stages in mitosis?

The molecules on the red blood cell membranes that make up a person's blood type are

Which concept is not associated with the work of Gregor Mendel?

Which statement describes the work of Gregor Mendel?

In guinea pigs, black fur (B) is dominant over white fur (b) and rough fur (R) is dominant over smooth fur (r). A cross between two guinea pigs hybrid for both traits (BbRr x BbRr) produces some offspring that have rough, black fur and some that have smooth, black fur. The genotypes of these offspring illustrate the genetic concept of

All of the offspring produced in a cross involving a brown mink and a silver-blue mink are brown. When these brown mink offspring were crossed with each other, the ratio of brown to silver blue was 3:1. The results of these crosses are best explained by

Pea plants heterozygous for both height and colour of seed coat (TtYy) were crossed with pea plants that were homozygous recessive for both traits (ttyy). The offspring from this cross included tall plants with green seeds, tall plants with yellow seeds, short plants with green seeds, and short plants with yellow seeds. This cross best illustrates

In raccoons, a dark face mask is dominant over a bleached face mask. Several crosses were made between raccoons that were heterozygous or dark face mask and raccoons that were homozygous for bleached face mask. What percentage of the offspring would be expected to have
a dark face mask?

When two heterozygous tall plants are crossed, some short plants appear in the offspring. The appearance of these short plants illustrates

In squirrels, the gene for grey fur (CG) is dominant over the gene for black fur (g). If 50% of a large litter of squirrels are grey, the parental cross that produced this litter was most likely

In a certain species of mouse, grey fur (G) is dominant over cream-coloured fur (g). If a homozygous grey mouse is crossed with a cream-coloured mouse, the genotype of the Fx generation will most likely be

Which two processes are best represented by the diagram shown below?

Round seed is dominant over wrinkled seed in pea. If homozygous, round seeded peas are crossed with wrinkled seeded peas, the offspring will be

If heterozygous round seeded pea plants are self-pollinated, the offspring will be

A man and a woman, both with normal thumbs, have a son with Hitchhiker's thumb. It is likely that ......... is (are) heterozygous.

Changes in speech patterns and mental retardation are due to the presence of an extra chromosome 21, the symptom is called

A decrease in the ability of the blood to carry oxygen due to the presence of abnormal haemoglobin molecules is caused by the altering of one codon in the genome

The inability of the blood to manufacture the enzyme needed for the metabolism of a specific amino acid ingested, is also called

A single change in the sequence of nitrogenous bases in a molecule of deoxyribonucleic acid would most likely result

Which nitrogenous base is normally used in the synthesis of ribonucleic acid but not in the synthesis of deoxyribonucleic acid?

In pigeons, checkered pattern is dominant over plain pattern and red colour is dominant over brown. A checkered brown female mated with a plain red male produced 2 checkered red, 2 plain red, and 1 checkered brown offspring. What are the probable genotypes of the parents?

Human body (somatic) cells contain ......... chromosomes; and the gametes (sex cells) contain .........chromosomes

How did Mendel's studies in genetics differ from earlier studies of breeding and inheritance?

When looking at the inheritance of a single characteristic, Mendel found that a cross between two true-breeding peas (between purple and white, for example) always yielded a ......... in the F2 generation

Alternative forms of genes for a particular characteristic are called