Heterozygous purple flower is crossed with recessive white flower. The progeny has the ratio :

Two crosses between the same pair of genotype or phenotypes in which the sources of the gametes are reversed in one cross, is known as

How many different types of gametes can be formed by F₁ progeny, resulting from the following cross AABBCC \(\times\) aa bb cc

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to

Indicate, the inheritance of which of the following is controlled by multiple alleles

A garden pea plant produced axial white flowers. Another of the same spcies produced terminal violet flowers. Identify the dominant traits

What are alleles?

What scientific term is used for the ability of a gene to show/express multiple effects?

Define mutation.

In which type of cells are chromosomal aberrations commonly found?

A change in the amino acid at the sixth position in the beta globin chain leads to sickle-cell anaemia.  Name the amino acid that has changed and the new amino acid.

What will be the genetic makeup of an organism which suffers from sickle cell anemia?

Using a punnett square work out distribution of phenotypic features in the first fillial generation after a cross between a homozygous female and a heterozygous male for a single locus

What do the letters P,F ₁ and F₂ represent in heredity?

How many chromatids are involved in crossing over at one chiasma?

A Corss between a red flower-bearing plant and a white flower-bearing plant of antirrhinum produced all plants having pin flowers.  Work out a cross to explain how this is possible.

How would you find the genotype of an organism exhibiting a dominant phenotype trait?

Inheritance is particulate in nature. Justify.

Justify the statement - A male honey - bee (drone) has no father, but has a grandfather.

what are the causes of variations in clones? Are identical twins clones of each other?

How was it conclused that genes are located on chromosome?

In cattle, hornless (H) is dominant over horned (h) and black (B) is dominant over red (b).  Consider that these two pairs of genes assort independently.
(i) What proportion of the offspring from the cross, BbHh \(\times\) bbhh, would be black and hornless?
(ii) From the cross Bbbh \(\times\) Bbhh, how many will be
(a) black and horned and 
(b) red and horned

Differentiate between monosamy and trisomy.  Give an example of each from human genetics.

How is aneuplody different from polyplodiy?  Mention their causes.

State and explain with the help of a cross the law of segregation as proposed by Mendel.

What exactly is dominance?  Why are some alleles dominant and some recessive?