Worksheets[Biology 9th] EASE 3 Prep
Total questions: 11
Worksheet time: 6mins
What will be the genotypes of the offspring resulting from a genetic cross between two individuals, one of which is homozygous dominant, (TT), and the other heterozygous?
all Tt
50% TT, 50% tt
50% TT, 50% Tt
25%TT, 75% Tt
A genetic cross between two organisms may be shown as Gg × Gg. What does g represent?
a dominant allele
a dominant chromosome
a recessive chromosome
a recessive allele
Which statement about the human sex chromosomes is correct?
Everybody has at least one X chromosome
All boys have two Y chromosomes
Girls have a Y chromosome and an X chromosome
Nobody has two X chromosomes
In pea plants the allele for tall, T, is dominant to the allele for dwarf, t. Which cross would produce plants in the proportion of 3 tall : 1 dwarf?
TT × Tt
Tt × Tt
Tt × tt
tt × tt
Which name is given to the observable features of an organism?
alleles
genes
genotype
phenotype
A breeding plant with smooth stems (Hh) was crossed with a heterozygous plant with hairy stems (hh). What will be the ratio of hairy : smooth stems in the resulting plants?
1 hairy : 1 smooth
1 hairy : 3 smooth
3 hairy : 1 smooth
all hairy
In fruit flies, the allele for grey body, G, is dominant over the allele for black body, g. The result of a mating between two flies is shown.
What were the genotypes of the parents?
Gg × Gg
GG × gg
Gg × gg
GG × Gg
The diagram shows a maize (corn) cob with purple and yellow fruits. Purple (P) is dominant to yellow (p). What are the genotypes of the parent maize plants?
PP × pp
Pp × Pp
PP × Pp
pp × Pp
What is not a feature of natural selection?
competition for resources
production of many offspring
selection by humans
variation within the population
What is an example of a characteristic that shows discontinuous variation in humans?
blood group
body mass
height
width of hand
What is the role of anaerobic respiration in bread-making?
to produce alcohol to flavour the bread
to release enough energy to bake the bread
to release enough lactic acid to kill the yeast
to produce gas to make the bread rise
