Genetics grade 7

Front

What does Heterozygous mean?

Back

An organism that has different genes for a trait (Tt).

Front

What is the definition of Phenotype?

Back

What you see or the physical appearance of an organism.

Front

What is the definition of Genotype?

Back

The genetic makeup of an organism, represented by letters (e.g., TT, Tt, tt).

Front

What does Homozygous mean?

Back

An organism that has the same genes for a trait (TT or tt).

Front

What is the probability of heterozygous offspring in a Punnett Square with one homozygous dominant and one homozygous recessive parent?

Back

50%.

Front

If A = Brown Hair and a = Blonde Hair, what is the genotype of an offspring with brown hair?

Back

Possible genotypes are AA (homozygous dominant) or Aa (heterozygous).

Front

What is a Punnett Square used for?

Back

To predict the probability of offspring genotypes and phenotypes from parental genes.

Front

What is the expected phenotype ratio for a monohybrid cross between two heterozygous parents (Tt x Tt)?

Back

3:1 (3 dominant: 1 recessive).

Front

What is the definition of a trait?

Back

A characteristic or feature of an organism, such as eye color or height.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions.