Science Fill in the blank

The characteristic which is visible in an organisms is called its Genotype.
Explanation:
The observable traits expressed by an organism are referred to as its phenotype. An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype.

Genes always work in Pairs.

Most people have Free earlobes but some have attached earlobes.

The Sex chromosomes for a Female are XX whereas that for a male are XY.

The human forelimb and bat’s forelimb are an example of Homologous organs whereas an insect’s wing and a bat’s wing are an example of Analogous organs.

A zygote which has an X-chromosome inherited from the father will develop into a Girl.
Explanation:
A zygote that has an X-chromosome inherited from father will develop into a girl. All children whether boys or girls inherit an X-chromosome from their mother. Thus, sex is determined by what they inherit from their father. A child who inherits X-chromosome from her father will be a girl, and one who inherits a Y-chromosome from him will be a boy.

The scientific name of all human beings is Homo sapiens.

Exchange of genetic material takes place in sexual reproduction reproduction.
Explanation:
The exchange of genetic material occurs during meiosis, that takes place in the gametes of sexually reproducing organisms.

All races of man have Four blood groups.

A human gamete contains 24 chromosomes whereas a normal body cell has 46 chromosomes in it.

Broccoli has evolved from Wild Cabbage by the process of artificial selection.

In pea plants, the gene for dwarfness is Recessive whereas that for tallness is Dominant.

The component of a chromosome that controls heredity is DNA.
Explanation:
Genes are contained in chromosomes, which are mainly in the cell nucleus.

The theory of natural selection for evolution was proposed by Darwin.

The evolution of eye is an example of evolution by Stages.