Models of single-gene inheritance: Punnett squares

12 questions

1. Which is the genetic code?
2. Which statement best describes the relationship between phenotype and genotype?
3. Horse body cells have 64 chromosomes. How many chromosomes will there be in a horse's unfertilised egg cell?
4. True or false? Offspring inherit different genes from each parent.
5. In humans the CF protein affects the stickiness of mucus. There are two alleles F and f. Individuals with the genotype ff have very sticky mucus. Which allele is dominant?
6. Plants produce either red pigmented flowers or white flowers with no pigment. The RR or Rr genotypes have red flowers. Plants with rr genotype have white flowers. Order the statements to explain how.
7. Match the word to its meaning.
8. The nucleus of a chimpanzee body cell contains 48 chromosomes. How many chromosomes will there be in the nucleus of a chimpanzee zygote?
9. A woman is heterozygous (Ff) for the gene that codes for a protein. What genotypes can her eggs have?
10. Two heterozygous (Rr) red flowered plants cross pollinate each other. Use the Punnett square to work out the ratio of red : white flowering offspring.
11. A couple who are both heterozygous (Ff) for the A gene want to have a child. Use the incomplete Punnett square to work out the probability that the child will be homozygous recessive.
12. Flowers can be red (RR or Rr) or white (rr). A single plant with red flowers pollinates itself. Some of the offspring plants have white flowers. What was the genotype of the parent plant?

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