In his investigations into inheritance in pea plants, Gregor Mendel crossed plants that were tall with plants that were short. Tallness is dominant over shortness.
Use the following symbols for the alleles:
A pure-breeding tall plant (Plant 1, genotype TTTTTT) was crossed with a short plant (Plant 2). All the offspring (F1 generation) were tall.
Two of these F1 offspring (Plant 3 and Plant 4, both heterozygous) were then crossed.
State the genotype of Plant 2.
Complete the cross to find the male gametes and the four offspring genotypes (A, B, C, and D) represented in the table below:
| Female | TTT | ttt |
|---|---|---|
| Male ? | A | B |
| Male ? | C | D |
Determine the expected phenotypic ratio of tall plants to short plants in the offspring.
What does the term 'homozygous' mean?
State one reason why the importance of Mendel's work was not recognized by other scientists in 1866.
76 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.