Principle of inheritance and variation practice · Mixed difficulty

When the number of recombinant progeny is usually less than the number expected in independent assortment it is called

Red flower (RR) are dominant over white flowers (rr). Tall plants (TT) are dominant over dwarf plants (tt). If a plant with genotype TTRr is crossed with ttrr plant, then what percentage will have red flowers on tall plants:

In a mutational event, when adenine is replaced by guanine, it is the case of

Mendel could not find out linkage because
I. some genes are linked but they are too far apart for crossing over to be distinguished from independent assortment
II. linked genes, were never tested for the same time in same cross
III. all seven genes, were present on the same chromosomes
IV. all seven genes were present on 4 chromosome but they were present far apart
Find out the correct option

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What
Is the probability of their grandson being colour blind?

Which one of the following traits of garden pea studied by Mendel was a recessive feature?

Husband has blood group-A and wife has blood group-B. What is the blood group of children?

Three children in a family have blood types O, AB and B respectively. What are the genotypes of their parents?

Test cross involves

Assertion (A): Male and female ratio is almost equal in this world.

Reason (R): Male and female genotype is XX and XY respectively.

A common test to find the genotype of hybrid is by;

Assertion: In Cucurbita pepo, variety of fruit is
result of recessive epistasis.

Reason: In recessive epistatsis, a recessive gene
at one locus enhances the expression of another
gene, at a different locus.

In a cross of four O’clock plants in the progeny half pink flower plants and half white flower plants are produced, the genotype of plant crossed is

Failure of cytokinesis after telophase stage of cell division results in an increase in whole set of chromosomes in an organism__________ phenomenon is

The TWO horizontal lines between a male and female in pedigree analysis indicates

A violet flowered pea plant is crossed with white flowered pea plant. In $F_1$ generation, violet flowered and white flowered plants were produced in $1: 1$ ratio. If violet flowered plants of this generation is self crossed then what would be the percentage of pea plant in $F_2$ generation which are true-breeding violet flowered?

In human male a spermatogonium contains ____________ chromosomes

Genes for colour blindness is carried by
I. Abnormal development II. Father
III. Mother IV. Autosomes

The genotype of a plant showing the dominant phenotype can by

A woman is married for the second time. Her first husband was ABO blood type A, and her child by that marriage was type O. Her new husband is type B and their child is type AB.
What is the women’s ABO genotype and blood type?

If haploid chromosomal number in a mammal is 24, the monosomic number will be

If Mendel had studied 7 traits using a plant of 12 chromosomes instead of 14
Choose the correct option for probable result

Consider the following statements about the $A B O$ blood grouping in human beings and select the incorrect pair from the given options

a. ABO blood groups are controlled by gene I, having three alleles $I^A, I^B$ and $i$.

b. $I^A$ and $I^B$ are completely dominant over i but $I^A$ and $I^{\mathrm{B}}$ show incomplete dominance when they are present together

c. The alleles $\mathbf{I}^{\mathrm{A}}$ and $\mathbf{I}^{\mathrm{B}}$ produce almost similar form of sugar but the $\mathrm{i}$ allele produce a completely different sugar

d. A total of six different genotypes and four phenotypes are possible

Centromere is required for

If a couple who are carriers for sickle cell
anaemia, decide to become parents, what
will be the odds that their children will also
be carriers?

In a pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of green and yellow seeded plants would you except progeny.

Tt is crossed with ______ to give both tall and dwarf progeny in equal number

Which of the following law was discovered first by Mendel?

Assertion (A): There are six different combinations or genotypes of the human ABO blood types.

Reason (R): The gene $(I)$ has three alleles $I^A, I^B$ and $I^{O}.$

Which of the following genes show the hetertozygous condition?