Deviation From Mendelian Genetics

The fundamental cause of the sickle-cell disease is a change in the structure of:

A plant of Antirrhinum majus with red flowers was crossed with another plant of the same species with white flowers. The plants of the F₁ generation bore pink flowers. The pattern of inheritance is exhibiting:

A woman with blood group O married a man with AB group. The possible genotype of their progeny would be:

A plant of Antirrhinum majus with red flowers was crossed with another plant of the same species with white flowers. The plants of the F₁ generation bore pink flowers. The pattern of inheritance is exhibiting:

Which one of the following pairs of features is an excellent example of polygenic inheritance?

Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) and aabbcc (light colour), in $F_2$ generation, what proportion of the progeny is likely to resemble either parent?

Choose the correct option regarding the inheritance of flower colour in Antirrhinum (dog flower).

What will be number of gene pairs controlling a single character in polygenic inheritance if the phenotypic ratio obtained in ${\mathrm{F}}_2$ generation is $1 : 6 : 15 : 20 : 15 : 6 : 1?$

Which ONE of the following is the most likely ratio of blood groups $(\mathrm{A} : \mathrm{B} :\mathrm{AB})$ among the progeny from heterozygous parents with $\mathrm{B}$ and $\mathrm{AB}$ blood groups?

What will be the genotype of the parents, when their children are with A, B, AB and O blood group?

The phenotypic ratio of incomplete dominance is _____.

How many different blood groups are possible in a diploid species with $\mathrm{ABCO}$ blood grouping system involving ${\mathrm{I}}^{\mathrm{A}}, {\mathrm{I}}^{\mathrm{B}}, {\mathrm{I}}^{\mathrm{C}}$ and ${\mathrm{I}}^{\mathrm{O}}$ alleles (${\mathrm{I}}^{\mathrm{O}}$is recessive and others are codominant)?

The genotype of a person with B blood group is _____. The phenotypic blood group of a person with genotype ii will be _____.

If the genotypes determining the blood groups of a couple are $I^{\mathit{A}}{I}^{\mathit{0}}$ and $I^{\mathit{A}}{I}^{\mathit{B}}$, then the probability of their first child having type $O$ blood is

In a diploid organism, when the locus X is inactivated by locus Y, transcription of the locus Y is triggered. Based on this observation, which one of the following statements is CORRECT?

Which one of the following genetic phenomena is represented by the blood group AB?