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Mendelian Genetics Challenge

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Mendelian Genetics Challenge

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Quiz on genes, Punnett squares, inheritance.

Created by

Jan Barbee
Jan Barbee
United States

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Mendelian Genetics Challenge
 

Mendelian Genetics ChallengeOnline version

Quiz on genes, Punnett squares, inheritance.

by Jan Barbee
1

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

2

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

3

What does a Punnett square illustrate?

4

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

5

What is a homozygous genotype?

6

What is codominance?

7

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

8

In a standard autosomal recessive trait, a carrier is:

9

Which term describes the physical expression of a trait?

10

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

11

What does a test cross help determine?

12

Incomplete dominance results in:

13

What is the genotype of a recessive phenotype?

14

A monohybrid cross tracks how many genes?

15

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

16

What is epistasis?

17

Which allele combination produces a recessive phenotype?

18

What does Mendel’s law of segregation state?

19

What is a punnett square used to predict?

20

Which result best describes sex-linked inheritance?

21

What is a purebred line in genetics?

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A 1:1:1:1 phenotype ratio is not typical for monohybrid crosses; ratios depend on dominance.

A classic dihybrid cross yields 9:3:3:1 for two dominant trait phenotypes.

It shows potential allele combinations; phenotypes depend on dominance and environment.

Cross yields all Aa; each offspring is heterozygous.

Homozygous means identical alleles (AA or aa).

In codominance, both alleles contribute to phenotype (e.g., AB blood).

Many sex-linked traits are X-linked; males express X-linked recessives readily.

Carriers have one normal and one recessive allele (Aa).

Phenotype is the observable trait; genotype is the genetic makeup.

9/16 yields both dominant traits in a dihybrid cross assuming independent assortment.

Cross with homozygous recessive reveals if dominant phenotype is AA or Aa.

Heterozygotes show an intermediate phenotype (e.g., pink snapdragons).

Recessive phenotype requires two recessive alleles (aa).

Monohybrid involves a single gene, typically with two alleles.

Autosomal dominant can appear in every generation; a new mutation is possible.

Epistasis occurs when one gene hides the phenotype of another gene.

Recessive phenotype requires two recessive alleles (aa).

Alleles separate so each gamete carries one allele from each gene.

It enumerates allele combinations to predict genotypes.

X-linked traits show distinct sex-based inheritance patterns.

Purebreds are consistently homozygous for the traits studied.

 
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