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WorksheetsInheritance
Total questions: 12
Worksheet time: 11mins
Tall (T) is dominant over dwarf (t) in a species of plant. A tall plant has an unknown genotype. Which plant should it be crossed with to ascertain this?
TT
Tt
tt
Sperms can have
Only X chromosome
Only Y chromosome
Either X or Y chromosome
Either XX or XY chromosomes
Ova (eggs) can have
Only X chromosome
Only Y chromosome
Either X or Y chromosome
Only XX chromosomes
What is the percentage of a woman having a male child?
25%
50%
75%
100%
A couple has 6 children but of them, 5 were boys. What reason explains why this deviates from the expected 3 boys : 3 girls ratio?
The female suffers from a genetic disorder.
The male only release sperms with the Y chromosome.
The sample size is too small.
The correct ratio is actually 5:1. There is nothing wrong.
A brown eyed man of genotype Bb marries a blue eyed woman. What is the chance that their third child is brown eyed?
25%
50%
75%
100%
A couple has had 1 child, who is a boy. Which of the following statements is true?
Their second child will be a girl because the ratio of boy:girl is 1:1.
Their second child will be definitely be a girl because the chance of her being a girl is 50%.
Their second child has a 50% chance of being either a boy or a girl as gender of the first child has no effect on the subsequent children.
A rose species has color which is determined by alleles R and r. A genotype of RR will give rise to red coloration, while rr gives rise to white coloration. Which of the statements is false?
The alleles R and r are different forms of a gene.
A gene is made up of proteins.
A gene consists of a DNA sequence.
The heterozygous genotype will have a phenotype of red.
Which of the following traits exhibit discontinuous variation?
weight
IQ (intelligence quotient)
skin colour
left or right handedness
Somatic cells have 46 chromosomes. A boy's somatic cells would have ______
46 identical chromosomes of identical length.
46 chromosomes of varying length.
22 pairs of different chromosomes, but each pair is of the same length; one X and one Y chromosome.
22 pairs of different chromosomes, but each pair is of the same length; and two X chromosomes.
A dominant trait expresses itself
only in homozygous genotypes
only in heterozygous genotypes
both in homozygous and heterozygous genotypes
A recessive trait expresses itself
only in homozygous genotypes
only in heterozygous genotypes
in both homozygous and heterozygous genotypes
