Mendelian Genetics Flashcards

Flashcards covering Mendelian Genetics concepts, Punnett squares, and related vocabulary.

What is the genotype and phenotype of a cat with heterozygous, long-haired traits (Ss) when crossed with a homozygous short-haired cat (ss)?

Genotype: Heterozygous (Ss), Phenotype: Short hair

What is the probability of offspring having long hair when one parent is heterozygous (Ss) and the other is homozygous recessive (ss)?

0% (Long hair is recessive. The offspring will have short hair)

What is the genotype and resulting phenotype for a homozygous red flower?

Genotype: Homozygous red (RR), Phenotype: Red

What is the genotype and resulting phenotype for a homozygous white flower?

Genotype: Homozygous white (rr), Phenotype: White

If a homozygous red (RR) plant is crossed with a homozygous white (rr) plant, what is the probability of offspring having a white color?

0%

What is genetics?

The study of heredity

What is a homozygus?

An organism with two identical alleles

What is a heterozygus?

An organism with two different alleles

What is an allele?

A different version of a gene

What is a dominant allele?

The allele that is expressed in a heterozygous offspring

What is a recessive allele?

The allele not expressed in a heterozygous offspring

What is a genotype?

The alleles an individual inherits

What is a phenotype?

The expression of an organism’s genotype

What are the expected genotype percentages of ofspring in a cross between two heterozygous parents (Bb x Bb)?

Genotypes: 25% BB, 50% Bb, 25% bb

What are the expected phenotype percentages in a cross between two heterozygous parents (Bb x Bb), assuming B is dominant for purple flowers and b is recessive for white flowers?

Phenotypes: 75% purple flowers, 25% white flowers (assuming purple is dominant)

Predict the percentages of genotypes for offspring you would expect in any cross between a homozygous dominant parent (BB) and a homozygous recessive parent (bb).

Genotype: 100% Bb

Predict the percentages of phenotypes for offspring you would expect in any cross between a homozygous dominant parent (BB) and a homozygous recessive parent (bb).

100% Bb

Predict the percentages of genotypes and phenotypes you would expect in any cross between a heterozygous parent (Bb) and a homozygous recessive parent (bb).

50% Bb, 50% bb