Genetics LTSD-M

Front

What is the physical appearance of a trait called?

Back

Phenotype

Front

What is the genetic makeup of an organism called?

Back

Genotype

Front

In genetics, what does it mean if an organism is homozygous?

Back

An organism is homozygous if it has two identical alleles for a particular gene.

Front

What is the phenotypic ratio of offspring from a heterozygous black mouse (Bb) crossed with a white mouse (bb)?

Back

2 Black: 2 White (1:1 ratio)

Front

What is the chance of two parents with blood types AB and O producing an offspring with blood type O?

Back

0%

Front

What is the probability of a woman heterozygous for type A blood and a man heterozygous for type B blood having an offspring with type AB blood?

Back

25%

Front

What is Tay-Sachs disease?

Back

A lethal, autosomal recessive genetic disorder.

Front

If both parents are heterozygous carriers of Tay-Sachs disease, what are the chances of them having a child who is also a heterozygous carrier?

Back

50%

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

Front

What is a recessive trait?

Back

A recessive trait is one that is only expressed in the phenotype when two copies of the allele are present.