IB Option B

Which is homozygous?

• Bb

• bb

• BB

Which is heterozygous?

• Bb

• BB

• bb

Which is the phenotype?

• Black fur

• Bb

Which is the genotype?

• Black fur

• Bb

Which is homozygous recessive?

• Bb

• bb

• BB

Which is the dominant allele?

• b

• B

The number of ????????? in ????????? individuals plays a role in increasing genetic biodiversity.

• alleles, homozygous

• genes, homozygous

• genes, heterozygous

• alleles, heterozygous

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

Eye and body color in fruit flies are close together on the same chromosome.

What can be said about studying these traits?

• The traits would not obey the law of independent assortment because they are always inherited separately.

• The traits would not obey the law of segregation because they are always inherited separately.

• The traits would not obey the law of independent assortment because they are not inherited separately.

• The traits would obey the law of segregation because they are not inherited separately.

Scientists study apple trees. In the fruit color gene, G leads to green apples and is dominant over red (g). S leads to sweet apples and is dominant over sour (s). They find the alleles for the two genes are arranged as shown on the same chromosome. Which of the following situations will they observe?

• The two traits will not be inherited independently of one another.

• Both genes will have an effect on the other trait.

• One gene will cancel out the effect of the other.

• The environment will determine the traits of the apple, not the two genes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is a case of an environmental effect changing a phenotype?

• Caterpillars with a parent with red wings and another with blue wings develop purple wings.

• Caterpillars in cocoons under different colors of light develop different-colored wings.

• Caterpillars that receive two recessive traits from parents develop no wings as a defect.

• Caterpillars with both parents having red wings develop red wings.

Tags

NGSS.HS-LS2-6

NGSS.HS-LS4-5