Genetics Crosses

A mutation is

• any change that is harmful

• any change in a gene or chromosome

• any change that is helpful

• any change in the phenotype

Tags

NGSS.HS-LS3-2

An organisms's allele combination is known as

• phenotype

• mutation

• hybrid

• genotype

If a homozygous black cat (BB) is crossed with a homozygous white cat (bb), what is the probability of having a cat with white fur?

• 100%

• 0%

• 75%

• 25%

Tags

NGSS.HS-LS3-1

What does RR mean

• two dominant alleles

• heterozygous alleles

• at least one dominant allele

• one dominant and one recessive allele

What is the primary generation for a Punnett Square called?

• F2 generation

• F1 generation

• P generation

• G generation

What is the genotypic ratio of the offspring?

• 3 AA : 1 aa

• 1 AA : 3 aa

• 1 AA : 2 Aa : 1 aa

• 2 AA : 2 aa

Tags

NGSS.HS-LS3-2

What are the phenotype percentages of the offspring?

• 50 % Brown fur and 50% White fur

• 25 % Brown fur and 75% White fur

• 75 % Brown fur and 25% White fur

• 0% Brown fur and 100% White fur

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What allele combination should go in the missing box?

• AA

• Aa

• aa

• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?

• 0%

• 25%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

An allele whose trait only shows up when no dominant allele is present.

• hidden allele

• dominant allele

• recessive allele

• present allele