U4 STUDY GUIDE CH1-5

Is the long-haired cat in the P generation a hybrid or a purebred? Explain your answer.

• It is a purebred because it has two recessive alleles for long hair. If it were a hybrid, it would have both the dominant and recessive allele and have short hair because the dominant allele always masks the recessive allele.

• It is a purebred because it has two dominant alleles for long hair. If it were a hybrid, it would have both recessive allele and have short hair because the dominant allele always masks the recessive allele.

• It is a hybrid because it has two recessive alleles for long hair. If it were a purebred, it would have both the dominant and recessive allele and have short hair because the dominant allele always masks the recessive allele.

• It is a hybrid because it has two dominant alleles for long hair. If it were a purebred, it would have both recessive allele and have short hair because the dominant allele always masks the recessive allele.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If the short-haired cat in the P generation were purebred, what would you expect the offspring to look like?

• One offspring would have short hair and three offspring would have long hair.

• Two offspring would have short hair and two offspring would have long hair.

• All offspring would have long hair.

• All offspring would have short hair.

In guinea pigs, the allele for a smooth coat (S) is dominant over the allele for a rough coat (s). What would be the alleles for a purebred rough coat guinea pig?

• SS

• Ss

• ss

• sS

A seed can be round or wrinkled. Seed shape is____.

• a factor

• an allele

• a trait

• a gene

In one classic experiment, Mendel crossed two purebred pea plants, one tall and one short. In the first generation offspring (F1), all of the plants were tall. When these F₁ plants were crossed, what would Mendel find?

• All of the plants were tall.

• All of the plants were short.

• Some of the plants were medium-sized.

• Some of the plants were short, and some were tall.

A couple has three brown-eyed children.   The parents are brown-eyed (Bb). The allele for brown eyes is dominant over the allele for blue eyes. They believe the fourth child they have will be blue-eyed.

Which statement below explains what actually will happen?

• The couple will have a blue-eyed fourth child.

• The couple will have a brown-eyed fourth child.

• The couple has a 25 percent chance of having a blue-eyed child.

• The couple has a 75 percent chance of having a blue-eyed child.

Which of the following best describes heredity?

• Some genes help an individual survive in their environment.

• Individuals have different genes.

• Parents pass on their traits to their children through genes.

• Random changes can alter the information a gene contains.

Tags

NGSS.MS-LS3-2

If the allele for white flowers is dominant and the allele for purple flowers is recessive, what is the phenotype of the offspring in the F₁ generation?

• purple

• white

• WW

• Ww

Tags

NGSS.MS-LS4-4

In the Punnett square for the F₂ generation, what percentage of the offspring are purple?

• 25 percent

• 50 percent

• 75 percent

• 100 percent

Tags

NGSS.MS-LS3-2

Which of the following is an example of how environmental factors can affect the expression of genes?

• vocal cords allow human speech

• hair dye affects hair color

• exercise increases muscle size

• contact lenses change eye color

Tags

NGSS.MS-LS1-5