A man and woman who both have normal pigmentation but both having an albino parent have two children both with normal pigmentation. What is the probability that their child might be an albino?
1. 0
2. ¼
2. ½
3. ¾

In geranium, self-polination of plants with red flowers results in 1/4 red, 2/4 pink and 1/4 white flowered plants. This is most likely due to
1. The soil in which the pink plant was growing was deficient in a critical nutrient.
2. The pink plant had a new mutation, creating an allele to which the wild type "red" is incompletely dominant.
3. The pink plant had a new mutation, creating an allele which is incompletely dominant to red.
4. The pink plant had a new mutation, creating an allele which is codominant to "red".

A true breeding (pure line) plant can be differentiated from a hybrid as:
1. They only have one type of allele of the gene that controls the trait of interest.
2. They carry two different alleles for the gene that controls the trait of interest.
3. They can only reproduce by self fertilization.
4. They all have dominant alleles for the trait of interest.

 

Test cross in plants or in Drosophila involves crossing:
1. between two genotypes with dominant trait
2. between two genotypes with recessive trait
3. between two F₁ hybrids
4. the F₁ hybrid with a double recessive genotype

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.

A dominant unit factor (trait) is best defined as
1. The most common trait in the population.
2. The trait that is seen in a heterozygous organism (hybrid).
3. A trait that reappears in the F2 of a monohybrid cross.
4. A trait that causes differential reproduction

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

The genotypes of a Husband and Wife are IAIB and IAi .
Among the blood types of their children how many different genotypes and phenotypes are possible
1. 3 genotypes ; 3 phenotypes
2. 3 genotypes; 4 phenotypes
3. 4 genotypes ; 3 Phenotypes
4. 4 genotypes ; 4 phenotypes