Week 17: Extra Credit Flashcardizz (Genetics)

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences. Example: Blue eyes.

Front

What is the probability of a baby being blue-eyed if both parents are heterozygous brown-eyed (Bb)?

Back

The chance is 25%.

Front

If you cross a horse with WW (white hair) and a horse with ww (non-white hair), what fraction of the offspring will have white hair?

Back

All of the offspring will have white hair.

Front

What does it mean to be homozygous?

Back

Homozygous means having two identical alleles for a particular gene. Example: BB or bb.

Front

Which genotype is recessive: BB, Bb, or bb?

Back

bb is the recessive genotype.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents. Example: Bb.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles (e.g., BB or bb), while heterozygous means having two different alleles (e.g., Bb).

Front

What is a dominant trait?

Back

A dominant trait is a genetic trait that is expressed in the phenotype even when only one copy of the allele is present. Example: Brown eyes (B) are dominant over blue eyes (b).

Front

What is a recessive trait?

Back

A recessive trait is a genetic trait that is only expressed in the phenotype when two copies of the allele are present. Example: Blue eyes (bb) are recessive.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.