9 questionsð¬ð§English
𧬠Genetic Inheritance â GCSE
Biology · GCSE â practise genetic key terms, Punnett squares and predicting the outcomes of genetic crosses
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Questions
In genetics, what is an allele?
A pair of matching chromosomes
A different version of the same gene
The physical appearance of a trait
A cell with half the chromosomes
20s
A person has the genotype Bb. Which term describes this genotype?
Homozygous dominant
Heterozygous
Homozygous recessive
Codominant
20s
Which pair of sex chromosomes does a typical human male have?
YY
XY
XX
XO
20s
In pea plants, tall (T) is dominant to short (t). What is the phenotype of a plant with genotype Tt?
Tall
Short
Medium height
Tall or short at random
20s
In humans, what determines whether a baby is male or female?
Whether the sperm carries an X or a Y
Which parent has more dominant alleles
How many X chromosomes the mother has
Whether the egg carries an X or a Y
30s
A heterozygous plant (Bb) is crossed with a homozygous recessive plant (bb). What proportion of offspring will show the recessive phenotype?
75%
50%
0%
25%
30s
Cystic fibrosis is caused by a recessive allele. Two parents are both carriers. What is the chance their child has cystic fibrosis?
0%
50%
25%
75%
30s
Purple flowers (P) are dominant to white (p). A cross of Pp à Pp produces 400 seeds. Approximately how many will grow white flowers?
0
200
300
100
60s
Two carriers of cystic fibrosis have a child who does not have the disorder. What is the probability that this child is a carrier?
2/3
3/4
1/4
1/2
30s