What term is given to an organism that carries two different alleles of a gene

What term is used to describe the observable features that an organism has due to the alleles that it carries?

What word is used to describe a version of a gene?

Which of the following is true of a dominant allele?

I. it is always expressed if it is present

II. two copies are needed to show its feature

III. it always causes a genetic disease

When carrying out a test cross, what is the organism of unknown genotype always crossed with?

Cystic fibrosis is a lung disease caused by a recessive allele, c.

Two healthy parents produce a child with cystic fibrosis.

Which of the following statements must be true?

Albinism is a genetic condition caused by a recessive allele, a.

People with this condition are called albinos. They have white hair and pale skin.

What is the probability of two parents who are heterozygous for this condition producing an albino child?

How many alleles for each gene are carried in all body cells?

A man of genotype I^AI^o and woman of genotype I^BI^o have a child.

What is the chance that the child will have the same blood group as one of its parents?

Which of the following statements are true of codominance?

I. Both alleles are expressed in a person who is heterozygous

II. More than two phenotypes are usually possible

III. The ABO blood group system is an example of it

A plant has two different alleles of a gene, G, resulting in it having a green seed.

Which row of the table describes the phenotype and genotype of the seeds of this plant?

The pedigree chart shows the inheritance of a genetic disorder in a family.

What conclusion can be made about this genetic disease?

The pedigree chart shows the inheritance of a genetic disorder in a family.

It is caused by a recessive allele, h.

What conclusion can be made about the people in the chart?

Which of the following genotypes are possible for a person of blood group A?

I. I^A I^A

II. I^A I^B

III. I^A I^O

Night-blindness is a genetic disorder caused by a dominant allele.

The pedigree chart shows the inheritance of this disorder in a family.

Person X marries someone with normal sight.

What is the probability of them having a child with night blindness?

Coat colour in a certain mammal is determined by two codominant alleles of a gene.

Allele B produces a black coat and allele W produces a white coat.

What would you expect the phenotype to be of a mammal who is heterozygous for this gene?

In a certain plant, the allele fo white fruit (W) is dominant over the allele for yellow fruit (w).

A white-fruited plant was crossed with a yellow-fruited plant.

About half of the offspring were white-fruited and the other half were yellow-fruited.

Which genotypes did the parent plants have?