Homozygous and Heterozygous

What are the chances of heterozygous genotypes in offspring?

• 50%

• 25%

• 1 in 4

• 75%

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Both parents in this Punnet square

• are homozygous dominant

• are homozygous recessive

• are heterozygous

• have blue eyes

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To express the recessive trait you must be

• homozygous dominant

• heterozygous

• alleleerific

• homozygous recessive

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How many boxes would say BB?

• 1

• 2

• 4

• 0

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What is the genotypic ratio here

• TT = 25% Tt= 50% tt=25%

• all tall

• TT= 75% tt = 25%

• Tt = 100%

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TT, tt, PP, pp, SS, ss are examples of alleles that are?

• homozygous

• heterozygous

• different

• homologous 

Having two of the same genes for the trait (sometimes called purebred).

• homozygous

• hetrozygous

• protein

• chromosome

Which is heterozygous ?

• Tt

• TT

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)

• An organism that has different genes for a trait (Tt)

• When neither gene is fully dominant; offspring is a mixture of both

• the different forms of a trait (hair color--> brown, blonde, red

A heterozygous yellow pea plant's genotype would be:

• YY

• yy

• Yy

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