Identify the incorrect statement regarding test cross?

1. It is used to determine the genotype of an individual exhibiting a dominant phenotype.

2. The testcross parent is always homozygous recessive for all of the genes under consideration.

3. The purpose of the testcross is to discover how many different kinds of gametes are being produced by the individual whose genotype is in question.

4. A homozygous dominant individual will produce two types of progeny and a heterozygous individual will produce only one type of progeny.

In pea, yellow seed colour is dominant over green colour. Heterozygous yellow seeded plant is crossed with green seeded plant. The ratio of yellow & green seeded offspring will be
1. 9 : 1
2. 1 : 3
3. 3 : 1
4.50 : 50

F₂ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1 It represents a case of :
1. Co-dominance
2. Dihybrid cross
3. Monohybrid cross with complete dominance
4. Monohybrid cross with incomplete dominance

In a testcross involving F₁ dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates:
1. Both of the characters are controlled by more than one gene.
2. The two genes are located on two different chromosomes.
3. Chromosomes failed to separate during meiosis.
4. The two genes are linked and present on the same chromosome.