Science : Ch 09 – Heredity and Evolution

Sexual reproduction Require exchange of genetic materials of male and female gametes to form

One pair called the sex chromosomes is odd, not always being a perfect pair. Women have a perfect pair mismatched pair, in which one is a normal-sized X while the other is a short one called Y (XY).

The two versions of a trait which are brought in by the male and female gametes are situated on copies of the same chromosome. Each parent contributes one copy of the gene for a particular trait.

The character of the cross will be cross fertilization, which is the transfer of pollen from one plant to the stigma of fower; borne on a distinct plant of the same species.

One of the conclusions of this theory is that the processes of genetic drift—random change in gene frequency—operate in different ways in two isolated population groups and make them more and more different from each other.

Genes are Detected on the chromosomes, which is present inside the nucleus of the cell in the crytoplasm.

Tall plants having round seeds as well as dwarf plants with wrinkled seeds. There were also new combinations like tall plants with wrinkled seeds and dwarf plants with round seeds in the F2 progeny.

The tendril of a pea plant and the phylloclade of Opuntia are homologous structures, as they are modifed stems but serve diferent functions in diferent plants.