This chart shows the results of several crosses with white-feathered chickens and dark-feathered chickens. Which cross would be represented as Aa x aa, where (A) represents a dominant allele and (a) represents a recessive allele?

• cross 1

• cross 2

• cross 3

• cross 4

Tags

NGSS.MS-LS3-2

A researcher sprays a new pesticide on thousands of insects of the same species that live in a large field. A few of the insects survive. What can be concluded by the researcher?

• The species of insects will likely become resistant to the pesticide.

• The ideal interval between the first and second applications of the pesticide should be increased.

• The pesticide has no effect on the species.

• The concentration of the pesticide was too weak.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS4-4

According to fossil records, the horses that lived 50 million years ago were much smaller, weaker, and slower than modern horses. Which process is most likely responsible for the changes that have led to the increased size, strength, and speed in horses?

• commensalism

• inbreeding

• migration

• natural selection

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

In a particular species of plants, when the soil pH is greater than 7, blue flowers are produced. However, when the soil pH is less than 7, pink flowers are produced. Which statement best explains the color change in the plant?

• Multiple alleles determine the color of the flowers.

• The change in flower color is a result of a mutation.

• Polygenic inheritance produces the different flower colors.

• The environment influences the expression of the gene for flower color.

Tags

NGSS.MS-LS1-5

A cloned plant has a diploid chromosome number of 12. What is the diploid chromosome number of the plant cell that was used to produce the cloned plant?

• 6

• 12

• 18

• 24

This diagram shows a diploid cell with two pairs of homologous chromosomes. Due to independent assortment, what is the possible genetic make-up of gametes produced by this organism?

• SsTt

• Ss, Tt

• S, s, T, t

• ST, St, sT, st

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

When worker bees return to the hive, they perform a sequence of movements called a waggle dance to show other members of the colony where food is located. Which type of behavior does this best illustrate?

• aggressive behavior

• courtship behavior

• social behavior

• territorial behavior

Which process is an example of asexual reproduction?

• An amoeba divides in half to form two amoebas.

• A bee transfers pollen from one flower to another.

• A female fish deposits eggs on a rock, then a male fish fertilizes them.

• Earthworms exchange sperm cells.

Tags

NGSS.MS-LS3-2

Which genetic abnormality can be identified through karyotyping?

• point mutation

• recessive allele

• extra chromosome

• sex-linked allele

Which structure in the leaf controls the opening and closing of the stoma?

• cuticle

• epidermis

• guard cell

• spongy mesophyll