A level Biology AQA Unit 7

Front

What is post-translational control of gene expression?

Back

Post-translational control refers to the regulation of gene expression after the protein has been synthesized, affecting the protein's activity and function. An example is liver cells beginning glycogenolysis in response to glucagon.

Front

What is independent assortment in meiosis?

Back

Independent assortment is the process during meiosis where different genes independently separate from one another when reproductive cells develop, leading to genetic variation.

Front

What is the phenotypic ratio of a cross between SsRR and ssrr onions?

Back

The phenotypic ratio is 1 red : 1 white.

Front

What is codominance in genetics?

Back

Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive, such as tortoiseshell fur in cats.

Front

What is the expected phenotypic ratio in the F2 generation of a black female cat mated with a ginger male?

Back

The expected phenotypic ratio is 1 black female : 1 tortoiseshell female : 1 black male : 1 ginger male.

Front

What is a taxonomic group?

Back

A taxonomic group is a category in the biological classification system used to organize and categorize living organisms based on shared characteristics.

Front

What is the smallest taxonomic group?

Back

The smallest taxonomic group is the Genus.

Front

What is the role of Hox genes in development?

Back

Hox genes are a group of related genes that control the body plan of an embryo along the head-tail axis, acting as transcription factors for many other genes.

Front

What is the significance of alleles in genetics?

Back

Alleles are different versions of a gene that determine specific traits, such as skin color or fur color, and can be dominant or recessive.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even in the presence of a recessive allele, while recessive alleles only express their trait when two copies are present.