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Mendelian Genetics Ratios

Total questions: 27

Worksheet time: 35mins

Name

Class

Date

In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?

100%

75%

50%

25%

The observable traits of an organism are known as its

allele

dominance

phenotype

genotype

Each parent contributes one of the genes for a particular trait. The genes of the pair are called:

variables

gametes

hybrids

alleles

A feature regulated by a set of genes (allele) passed on

from parents to offspring. Also called inherited traits.

Heterozygous

Mendel

Chromosome

Traits

Passing on traits from parents to offspring

Chromosome

Genotype

Heredity

Allele

The study of heredity

Genetics

Genome

Allele

Punnett Square

The instructions of this allele are covered up by the other allele in a homologous pair. Symbolized by a small letter.

Homozygous

Dominant

Recessive

Genetics

The letter symbols for both homologous alleles.

BB Bb bb AA Aa aa

Genotype

Phenotype

Recessive

Dominant

A genotype where one dominant and one recessive allele was passed on from both parents for one trait.

Bb Aa Tt Ll

Allele

Homozygous Dominant

Homozygous Recessive

Heterozygous

10.

The observable traits dictated by the genotype

Phenotype

Genotype

Homozygous Recessive

Homozygous Dominant

11.

The genetic cross between two parents for one trait:

Example BB x bb

B = dominant for brown

b = recessive for blue

Incomplete Dominance

Dihybrid Cross

Monohybrid Cross

Iron Cross

12.

Referring to the original parents.

P₁

F₁

F₂

Homozygous

13.

First Filial (child) Generation: the offspring of P₁

P₁

F₂

F₁

Heterozygous

14.

The ratio of homozygous dominant to heterozygous

to homozygous recessive offspring

Genotypic Ratio

Phenotypic Ratio

Monohybrid Cross

Homologous Pair

15.

The chance that a genotype or phenotype

will actually occur in offspring

Probability

Phenotype

Genotype

Homozygous Recessive

16.

The Italian monk/scientist who first showed

the principles of genetics

Watson and Crick

Linnaeus

Darwin

Mendel

17.

What do we call the result of the genotype (for example, the color of the peas)?

Visible traits

Physiotrait

Genotype 2

Phenotype

18.

If green is dominant over purple, then what is the genotype for this individual?

Purple

Green

19.

Another word for homozygous is...

purebred

hybrid

heterozygous

dominant

20.

Tt is-

homozygous dominant

homozygous recessive

heterozygous

none of these

21.

If a pea plant were homozygous recessive for height, how would its alleles be represented?

22.

A __________ is a segment of DNA that codes for a particular protein, which leads to a particular trait.

Gene

Allele

Codon

Nucleotide

23.

Which of the following is an example of a heterozygous genotype?

24.

What is the predicted percentage of homozygous recessive offspring in this cross?

25%

50%

75%

25.

Why do we see only tall plants in the second generation?

The gene for tall height is dominant

The gene for short height is dominant

The gene for tall height is recessive

The parents did not have the tall gene

26.

The dominant trait in this punnett square is

yellow pea seeds

green pea seeds

there is no dominant seed

27.

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

0 %

25%

50%

75%

Reset

Mendelian Genetics Ratios

Total questions: 27

Worksheet time: 35mins

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