Genes, Alleles & Punnett Squares | Baamboozle - Baamboozle

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What does a gene carry instructions for?

Making a protein or controlling a trait

Where are genes found in a cell?

On chromosomes in the nucleus

If both parents are Bb, what are the possible genotypes of their offspring?

BB, Bb, bb

How many copies of each gene do you inherit?

Two — one from each parent

What is the phenotype of a mouse with alleles bb for fur colour (b = white)?

White fur

Can two organisms have the same phenotype but different genotypes?

Yes — BB and Bb both produce the same dominant trait

Give an example of a homozygous recessive genotype

bb

What happens when a dominant allele is present?

It is always expressed

What information do you need to set up a Punnett square?

The genotypes of both parents

If a plant has alleles T and t for height, what does each allele represent?

T = tall, t = short

Can a heterozygous individual pass on a recessive allele?

Yes — it carries one copy of the recessive allele

How are alleles related to genes?

Alleles are different forms of the same gene

If an organism’s alleles are Bb, what is its genotype?

Bb

If an organism’s genotype is Tt, is it heterozygous or homozygous?

Heterozygous

Give an example of two alleles for eye colour

Brown (B) and blue (b)

Can a dominant trait “skip” a generation? Why or why not?

No — if the allele is inherited, it shows in the phenotype

Which is visible — genotype or phenotype?

Phenotype

How do you write a genotype for a recessive trait?

Using two lowercase letters, e.g. bb

Does a Punnett square predict exact offspring, or probabilities?

Probabilities

Give an example of a homozygous dominant genotype

BB

If a child shows a recessive trait, what do we know about the parents?

They both carried at least one recessive allele

Why does a heterozygous individual show the dominant trait?

The dominant allele masks the recessive one