Topic 4.8: Inheritance Questions

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.

What is shown by a karyogram?

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

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

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

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

State what is meant by the phenotype of an organism.

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

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

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

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.

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

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.

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

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

What is an allele?

Which statement correctly defines the genotype of an organism?

A condition is autosomal recessive (allele h). An unaffected woman has a child who is affected. What is her genotype?

Which row shows the correct way to write a dominant allele and its recessive partner for the same gene?

A DNA profile is produced for a child, the child's mother, and two men, Mr Okoro and Mr Pereira, who could be the biological father. The child's profile has five bands. Three of these bands also appear in the mother's profile. Of the remaining two bands, Mr Okoro has both and Mr Pereira has neither. Identify the child's biological father and explain how the DNA profiles support your answer.