Free Inheritance MCQs with Answers

• A. Thickening
• B. Width
• C. Length
• D. Distance

Explanation: The probability of a crossover between two genes is proportional to the distance between the two genes.

• A. Segregation
• B. Independent assortment
• C. Both Options A and B are correct
• D. None of these options are correct

Explanation: As the ratio is 3:1, it means there are only two traits under observation: the two possibilities for a gene (alleles).

• A. Kernel colour in wheat
• B. Skin colour in humans
• C. Height in humans
• D. Tongue rolling in humans

Explanation: Option A: Kernel colour in wheat is a continuously varying trait because it can vary between different shades of yellow, brown, and red.

• A. He produces eggs
• B. Color of his eyes changes
• C. His shoulders broaden
• D. None of the above

Explanation: Among the changes that typically occur in boys during puberty, the most likely one from the given options is: Deepening of the voice…

• A. 37
• B. 22
• C. 2
• D. 70

Explanation: Morgan and his students have found that linked genes show varied recom­binations, some being more tightly linked than others.

• A. Heterozygous
• B. Unicellular
• C. Homozygous
• D. None of these

Explanation: If both of the two gametes (sex cells) that fuse during fertilization carry the same form of the gene for a specific trait, the organism…

• A. 75%
• B. 50%
• C. 100%
• D. 25%

Explanation: As can be seen from the cross below, 50 percent of the offspring are heterozygotes, i.e. 50 percent possess the sickle cell trait.

• A. 100% of all females and males will be hemophilic
• B. Females have a 50% chance of getting haemophilia and males will be 100% hemophilic
• C. Carrier female 25%, hemophilic female 25%, normal male 25% and 25% hemophilic male
• D. Females and males both have 50% chance of getting hemophilia

Explanation: As per the cross given above, there are four possible genotypes and hence, four possible phenotypes.

• A. Alleles in an organism
• B. Two different alleles of a gene
• C. Having two identical genes
• D. Having two identical alleles of a gene

Explanation: Homozygous refers to a genotype where, for a given trait or gene, the organism possesses two alleles of the same type (i.e.

• A. When genes are linked and their loci are close to each other
• B. When some genes have mutated on the chromosome
• C. When there are too many Genes on a chromosome
• D. When genes are not linked and their loci are far apart

Explanation: According to the law of independent assortment, the alleles of two or more different genes get sorted into gametes independently of one…

• A. Sex combs on back legs
• B. Sex combs on front legs
• C. Sex combs on middle legs
• D. None of them

Explanation: Males are easily distinguished from females based on color differences, with a distinct black patch at the abdomen, less noticeable in…

• A. 3:1
• B. 9:3:3:1
• C. 1:1:2:1
• D. 1:1:1:1

Explanation: In the offspring of monohybrid crosses, or F2 generation, Mendel repeatedly observed a phenotype ratio of three plants with the dominant…

• A. Alleles are present on the same chromosome, but they assort independently due to recombination.
• B. Alleles are present on independent chromosomes and these separate and assort independently.
• C. Alleles are present on independent chromosomes and they are sorted independently during meiosis.
• D. Alleles are present on the same chromosome and their combination is dependent.

Explanation: Mendel's independent assortment is the segregation of factors for a trait independent of other factors during gamete formation followed by…

• A. Codominance
• B. Dominance
• C. Incomplete dominance
• D. Complete dominance

Explanation: In complete dominance, only one allele in the genotype is seen in the phenotype.

• A. Zero
• B. 25%
• C. 50%
• D. 100%

Explanation: The chances of a baby being either boy or girl are always 50% because in human beings there are 22 pairs of autosomes and one pair of sex…

• A. Locus
• B. Gene
• C. Allele
• D. Phenotype

Explanation: Different versions of the same gene are called alleles. Genes can have two or more possible alleles.

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Option D A plant with genotype RrYy, produce four types of gametes during fertilization. They are RY, Ry, rY, ry.

• A. The Y-chromosome is essential for the sex determination of Drosophila.
• B. Y-chromosome is female determining in Drosophila.
• C. Y-chromosome is male-determining in human beings.
• D. Y-chromosome has no role in sex determination either in Drosophila or human beings

Explanation: 'Genic Balance Theory' was proposed by C.B. Bridges in 1922 for sex determination in Drosophila.

• A. Genotype
• B. Trait
• C. Phenotype
• D. None of them

Explanation: Phenotype refers to physical appearance of a trait. Flower colour is an example of phenotype like height, eye colour and skin colour etc.

• A. 16%
• B. 25%
• C. 50%
• D. 100%

Explanation: The chances of colorblindness in the grandsons of a color-blind male, when his daughter is married to a normal male, depend on the…