Genes and Alleles
Biology ⇒ Genetics and Heredity
Genes and Alleles starts at 7 and continues till grade 12.
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See sample questions for grade 7
A pea plant has the genotype Tt for height. Is it homozygous or heterozygous?
If a child inherits a 'B' allele from one parent and a 'b' allele from the other, what is the child’s genotype?
If a gene has three alleles, how many alleles does an individual inherit for that gene?
If a gene has two alleles, T (tall) and t (short), what are the possible genotypes for this gene?
A pea plant has the genotype Tt for height. Is it homozygous or heterozygous?
Fill in the blank: The gene for flower color in a plant has two alleles, R (red) and r (white). The genotype Rr will result in __________ flowers if R is dominant.
If a mother has genotype Bb and a father has genotype bb, what are the possible genotypes of their children?
If both parents are heterozygous for a gene (Tt), what is the probability that their child will be homozygous recessive (tt)? (1) 0% (2) 25% (3) 50% (4) 75%
Genes are found on which structures inside the cell nucleus? (1) Chromosomes (2) Ribosomes (3) Mitochondria (4) Cell membrane
If a plant has two identical alleles for flower color, it is called: (1) Heterozygous (2) Homozygous (3) Dominant (4) Recessive
If both parents are heterozygous for a gene (Tt), what is the probability that their child will be homozygous recessive (tt)? (1) 0% (2) 25% (3) 50% (4) 75%
Which of the following best describes an allele? (1) A type of cell (2) A form of a gene (3) A protein (4) A sugar molecule
Fill in the blank: A __________ allele is masked when a dominant allele is present.
Fill in the blank: A person with two identical alleles for a trait is __________ for that trait.
Fill in the blank: Each parent contributes __________ allele(s) for each gene to their offspring.
Fill in the blank: The different forms of a gene are called __________.
True or False: A dominant allele will always show its effect in the organism’s appearance if present.
True or False: All genes have only two alleles.
True or False: All traits are controlled by a single gene.
True or False: Alleles are different forms of the same gene.
