Q. 14.5( 10 Votes )
Exchange of genetic material takes place during sexual reproduction. During sexual reproduction male and female gametes exchange their genetic material to form zygote.
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A trait in an organism is influenced byNCERT - Science Exemplar
Select the group which shares maximum number of common charactersNCERT - Science Exemplar
The number of pair (s) of sex chromosomes in the zygote of humans isNCERT - Science Exemplar
Select the statements that describe characteristics of genes
i. genes are specific sequence of bases in a DNA molecule
ii. a gene does not code for proteins
iii. in individuals of a given species, a specific gene is located on a particular chromosome
iv. each chromosome has only one geneNCERT - Science Exemplar
The two versions of a trait (character) which are brought in by the male and female gametes are situated onNCERT - Science Exemplar
Study the different conclusions drawn by students of a class on the basis observations of preserved/available specimens of plants and animals.
I. Potato and sweet potato are analogous organs in plants.
II. Wings of insects and wings of birds are homologous organs in animals.
III. Wings of insects and wings of bats are analogous organs in animals.
IV. Thorns of citrus and tendrils of cucurbita are analogous organs in plants. The correct conclusions are:Science - Board Papers
In peas, a pure tall plant (IT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be:Lakhmir Singh & Manjit Kaur- Biology
A zygote which has inherited an X chromosome from the father will develop into :Lakhmir Singh & Manjit Kaur- Biology
(a) E is the gene for brown eye color and e is the gene for blue eye color. Which gene is
(i) Recessive, and
(b) Both father and mother have the genes Ee in their cells. What color are their eyes?
(c) Which combination of genes in the zygote will produce children with blue eyes?
(d) Which combinations of genes in the zygote will produce children with brown eyes?Lakhmir Singh & Manjit Kaur- Biology