Topic 4.8: Inheritance Questions

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

What is shown by a karyogram?

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

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

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?

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

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

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.

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.

State what is meant by the phenotype of an organism.

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.

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

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

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

Which statement correctly defines the genotype of an organism?

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

Two parents who do not have cystic fibrosis already have one affected child. What is the probability that their NEXT child is also affected?

Two of the child's DNA bands match the mother and the remaining bands must come from the father. Which statement correctly describes how a child's DNA profile relates to its parents?

A black-feathered chicken (C^B C^B) is crossed with a white-feathered chicken (C^W C^W). All offspring have feathers that are BOTH black and white together (a speckled 'blue' bird). What does this show?