Sex-Linked, Co and Incomplete Dominance

A roan cow shows co-dominance in fur color (orange and white). What is the expected phenotypic ratio if a roan cow and a roan steer mate together?

• 100% Orange
• 1: Orange : 1 White
• 1 Orange: 1 Roan
• 1: Orange: 2  Roan: 1 White

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NGSS.HS-LS3-1

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A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?

• 0%
• 25%
• 50%
• 100%

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NGSS.HS-LS3-1

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In some carnations, flower color exhibits codominance. When crossed, red (RR) and white (WW) flowers make speckled flowers (RW) that show both colors.
Complete a cross between a speckled flower and a red flower. Find the phenotype ratio.

• 1 red: 1 speckled
• 4 red: 0 speckled
• 4 speckled: 0 white
• 1 speckled: 1 white

What type of inheritance do two alleles have if their traits blend together? 

• Incomplete Dominance
• Co-Dominance
• Mendelian Inheritance
• Homozygous Inheritance

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete Dominance
• Co dominance
• Independent assortment
• Recessive inheritance

A plant shows incomplete dominance in size. A tall plant (TT) is crossed with a medium plant (TS). What fraction of plants will also be tall?

• 100 %
• 75%
• 50%
• 25%

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NGSS.HS-LS3-3

How are Incomplete Dominance and Co Dominance different than a normal Mendelian cross?

• There is no difference
• The heterozygous genotype has a unique phenotype
• There is no heterozygous genotype
• There is only one phenotype regardless of genotype.

Hemophilia is a sex-linked recessive trait found on the x chromosome.  Complete a cross between a woman who is a carrier and a man who is normal.
What are the chances, if they have a daughter, that she is a carrier?

• 100%
• 75%
• 50%
• 25%

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NGSS.HS-LS3-1

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Hemophilia is a sex-linked recessive trait found on the x chromosome.  Complete a cross between a woman who has hemophilia and a normal man.
What are the chances of a child having hemophilia?

• 100%
• 75%
• 50%
• 25%

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NGSS.HS-LS3-1

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If a male has an affected x chromosome for a sex-linked trait such as colorblindness, where did he get the chromosome from?

• His father
• His mother

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