Science : Ch 09 – Heredity and Evolution

Hormones and enzymes are proteins, and the formation of any specific protein is controlled by a particular gene. Fat biosynthesis occurs through metabolic reaction.

The wings of an insect and a bird have distinct structures but they carry out the same function of fying. Therefore, they are analogous organs

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.

A species is a group of organisms consisting of similar individuals which can breed Jointly and produce fertile ofspring.

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

The cross between RR yy and rr YY seeds will obtain RrYy ofspring which will exhibit round and yellow phenotype, as these traits are the dominant ones.

The pair of sex chromosomes is odd as it is not a perfect pair. Women have a perfect pair of sex chromosomes, both called XX while men have a mismatched pair in which one is a normal sized X and the other is a short one called Y.

The sex of the children will be determined by what they inherit from their father. A child who inherits an X chromosome from her father will be a girl and the one who inherits a Y chromosome from him will be a boy

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.

Some dinosaurs had feathers, although they could not fy using those feathers. Birds seem to have later adapted the feathers for fight. This means that birds are closely related to reptiles and have evolved from them