Mendelian Genetics Challenge

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Quiz on genes, Punnett squares, inheritance.

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Jan Barbee

United States

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Mendelian Genetics Challenge


Mendelian Genetics ChallengeVersion en ligne Quiz on genes, Punnett squares, inheritance. par Jan Barbee 1 What is the phenotype ratio in a monohybrid cross 1:1:1:1? a 1:1:1:1 for dominant traits only b 2:2:1 ratio for all traits c There is no 1:1:1:1 ratio; phenotype ratios can vary. d 1:1 ratio for each phenotype 2 In a dihybrid cross AaBb x AaBb, what is the expected phenotypic ratio for dominant traits? a 9:7 b 9:3:3:1 c 1:1:1:1 d 3:1 3 What does a Punnett square illustrate? a Environmental influences on traits b DNA sequencing of offspring c Possible offspring genotypes from parental alleles d Exact phenotypes of future adults 4 If a homozygous dominant plant is crossed with homozygous recessive, the F1 genotype is: a All heterozygous b All homozygous dominant c All homozygous recessive d 50% homozygous dominant 5 What is a homozygous genotype? a An allele without dominance b A gene with multiple alleles c Two different alleles for a gene d Two identical alleles for a gene 6 What is codominance? a Only recessive allele expresses b Both alleles are silent c Both alleles express traits in heterozygotes d One allele completely masks the other 7 What is a sex-linked trait most often associated with? a Genes on the X chromosome b Y chromosome exclusively c Mitochondrial DNA d Genes on autosomes only 8 In a standard autosomal recessive trait, a carrier is: a Lacks any allele for the trait b Homozygous recessive c Homozygous dominant d Heterozygous with one recessive allele 9 Which term describes the physical expression of a trait? a Allele frequency b Gamete c Genotype d Phenotype 10 If AaBb is crossed with AaBb, what is the chance of offspring with both dominant traits? a 1/2 b 3/16 c 9/16 d 1/4 11 What does a test cross help determine? a Ancestor lineage b Environmental effects on trait c The genotype of an individual with a dominant phenotype d Dominant allele strength 12 Incomplete dominance results in: a A blended phenotype in the heterozygote b Only dominant trait expressed c No expression of the allele d Exclusive recessive phenotype 13 What is the genotype of a recessive phenotype? a Homozygous dominant b Heterozygous c Homozygous recessive d Any genotype with a recessive allele 14 A monohybrid cross tracks how many genes? a Two genes b Multiple genes with epistasis c Three genes d One gene with two alleles 15 If a trait is autosomal dominant, affected individuals can be: a Always homozygous b Only from carriers c From affected parents or new mutations d Only from affected parents 16 What is epistasis? a Two genes on different chromosomes b One gene masking another gene’s effect c A type of mutation d A trait expressed only in males 17 Which allele combination produces a recessive phenotype? a AA b Aa c Ab d aa 18 What does Mendel’s law of segregation state? a Traits are acquired, not inherited b Dominant alleles always win c Genes are blended in offspring d Alleles separate during gamete formation 19 What is a punnett square used to predict? a DNA sequences b Possible offspring genotypes c Environmental impact d Exact future height 20 Which result best describes sex-linked inheritance? a Identical in all individuals b Only recessive traits c Different patterns in males and females d No expression in females 21 What is a purebred line in genetics? a Homozygous for the traits observed b An unstable genotype c Heterozygous for many traits d A line with mixed ancestry Feedback 1 A 1:1:1:1 phenotype ratio is not typical for monohybrid crosses; ratios depend on dominance. 2 A classic dihybrid cross yields 9:3:3:1 for two dominant trait phenotypes. 3 It shows potential allele combinations; phenotypes depend on dominance and environment. 4 Cross yields all Aa; each offspring is heterozygous. 5 Homozygous means identical alleles (AA or aa). 6 In codominance, both alleles contribute to phenotype (e.g., AB blood). 7 Many sex-linked traits are X-linked; males express X-linked recessives readily. 8 Carriers have one normal and one recessive allele (Aa). 9 Phenotype is the observable trait; genotype is the genetic makeup. 10 9/16 yields both dominant traits in a dihybrid cross assuming independent assortment. 11 Cross with homozygous recessive reveals if dominant phenotype is AA or Aa. 12 Heterozygotes show an intermediate phenotype (e.g., pink snapdragons). 13 Recessive phenotype requires two recessive alleles (aa). 14 Monohybrid involves a single gene, typically with two alleles. 15 Autosomal dominant can appear in every generation; a new mutation is possible. 16 Epistasis occurs when one gene hides the phenotype of another gene. 17 Recessive phenotype requires two recessive alleles (aa). 18 Alleles separate so each gamete carries one allele from each gene. 19 It enumerates allele combinations to predict genotypes. 20 X-linked traits show distinct sex-based inheritance patterns. 21 Purebreds are consistently homozygous for the traits studied.

Mendelian Genetics Challenge

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À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Mendelian Genetics ChallengeVersion en ligne

par Jan Barbee

What is the phenotype ratio in a monohybrid cross 1:1:1:1?

In a dihybrid cross AaBb x AaBb, what is the expected phenotypic ratio for dominant traits?

What does a Punnett square illustrate?

If a homozygous dominant plant is crossed with homozygous recessive, the F1 genotype is:

What is a homozygous genotype?

What is codominance?

What is a sex-linked trait most often associated with?

In a standard autosomal recessive trait, a carrier is:

Which term describes the physical expression of a trait?

If AaBb is crossed with AaBb, what is the chance of offspring with both dominant traits?

What does a test cross help determine?

Incomplete dominance results in:

What is the genotype of a recessive phenotype?

A monohybrid cross tracks how many genes?

If a trait is autosomal dominant, affected individuals can be:

What is epistasis?

Which allele combination produces a recessive phenotype?

What does Mendel’s law of segregation state?

What is a punnett square used to predict?

Which result best describes sex-linked inheritance?

What is a purebred line in genetics?