MCA Biology

If a homozygous dominant parent and a heterozygous parent are crossed, what percentage of the offspring are expected to be heterozygous?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

One possible form of a gene that codes for a particular trait is known as _______.

• a chromosome

• a genotype

• an allele

• a phenotype

Tags

NGSS.HS-LS3-1

Which hereditary rule explains why a self-fertilizing parent that is heterozygous for the A locus (Aa) can produce offspring that are AA or aa?

• dominance

• principle of segregation

• codominance

• principle of independent assortment

How does DNA help with the transfer of genetic material from parents to offspring?

• Genes in DNA code for the production of proteins, which cause traits to be expressed.

• DNA is mutated by a chemical passed from parents to offspring to form proteins that express traits.

• Enzymes break down DNA, releasing amino acids that join to form proteins and express various traits.

• Proteins bind to DNA, which activates them and forces them to express certain traits.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

A steroid is an example of ​a (a)  

• lipid

• protein

• nucleic acid

• carbohydrate

A steroid is an example of a ​ (a)  

• Iipid

• protein

• carbohydrate

• nucleic acid

A student crosses two true-breeding pea plants, one with green pods and the other with yellow pods. If yellow is dominant over green, what phenotypic results will the student find in the F1 generation?

• 100% yellow

• 75% green, 25% yellow

• 75% yellow, 25% green

• 100% green

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

According to Mendel's Law of Segregation, meiosis involves the separation of a parent organism's alleles in order to form gametes. Since the alleles separate into different gametes, only one allele passes from each parent on to an offspring. This segregation of alleles during meiosis

• decreases the chance that an offspring will receive a dominant allele.

• increases the chance that an offspring will receive a dominant allele.

• decreases the genetic variability of the offspring.

• increases the genetic variability of the offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A student crosses two pea plants. One is homozygous dominant for axial flowers, and the other is heterozygous for axial flowers. If the student examines 200 offspring pea plants, which of the following is a reasonable result?

• 98 with axial flowers, 102 with terminal flowers

• 47 with axial flowers, 153 with terminal flowers

• 149 with axial flowers, 51 with terminal flowers

• 200 with axial flowers, 0 with terminal flowers

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Which of the following statements about the cells of any multicellular organism is true?

• The same genes are expressed in each cell.

• Each cell has completely different DNA.

• Different genes are expressed in different types of cells even thought almost all the cells have the same DNA.

Tags

NGSS.HS-LS1-4