Topic 4.8: Inheritance Questions

On a pedigree chart, what does a filled (shaded) square represent?

A pea plant is heterozygous for seed shape, genotype Rr. State the two types of gamete this plant can produce with respect to this gene.

A Punnett grid is completed for the cross Bb × Bb, where B is dominant. What genotype ratio appears among the offspring?

Which statement correctly defines the genotype of an organism?

In pea plants, T (tall) is dominant to t (short). Which genotype produces a short plant?

Which pair of sex chromosomes is found in a typical human female and which in a typical human male?

Draw a Punnett grid for this cross.

A condition is autosomal dominant. The allele causing it is H and the normal allele is h. In a pedigree, a woman labelled Q is affected by the condition, while her brother R is unaffected. State the possible genotype(s) of Q and the genotype of R using the symbols H and h.

Human ABO blood group is controlled by three alleles: I^A, I^B and i. Which genotype produces blood group AB?

What is an allele?

State the sex chromosomes present in a typical human female and in a typical human male.

In a cross between red and white snapdragons, the F1 plants are all pink. State the inheritance pattern this shows.

A student is studying coat colour in mice, where B (black) is dominant to b (brown). Define the term genotype, and state the genotype of a brown mouse.

An organism has the genotype Tt for a gene. Which term best describes this genotype?

What is shown by a karyogram?

State what is meant by a DNA profile (DNA fingerprint).

State what is meant by the phenotype of an organism.

Which process during sexual reproduction is a source of genetic variation among offspring?

Red-green colour blindness is an X-linked recessive condition (alleles Xᴮ normal, Xᵇ affected). A woman has normal colour vision. Which set of genotypes correctly gives ALL her possible genotypes?

Distinguish between the genotype ratio and the phenotype ratio produced by a monohybrid cross between two heterozygous parents (Tt × Tt), where T is dominant.