Question 1

Which process is responsible for producing sex cells (gametes) in humans, and how many chromosomes do these cells contain compared to somatic cells?

Accepted Answer

Meiosis; gametes have half the number of chromosomes as somatic cells.

Question 2

A scientist observes a plant with the genotype Rr for flower color, where R is dominant for red and r is recessive for white. What is the phenotype of the plant?

Accepted Answer

The plant has red flowers.

Question 3

Which of the following best describes the relationship between chromosomes, genes, and alleles?

Accepted Answer

Chromosomes contain genes, and genes can have different forms called alleles.

Question 4

A child inherits one allele for brown eyes (B) from their mother and one allele for blue eyes (b) from their father. What is the child's genotype and phenotype?

Accepted Answer

Genotype: Bb; Phenotype: Brown eyes

Question 5

Which of the following scenarios is an example of incomplete dominance?

Accepted Answer

A black cat and a white cat produce grey kittens.

Question 6

Which of the following best explains why Down Syndrome occurs?

Accepted Answer

An extra full or partial chromosome 21 is present.

Question 7

Which of the following is a benefit of genetic engineering in agriculture?

Accepted Answer

It can help crops resist insects and reduce the use of chemicals.

Question 8

Refer to the first image. According to the Law of Reflection, what is the relationship between the angle of incidence $$(	heta_i)$$ and the angle of reflection $$(	heta_r)$$?

Accepted Answer

$$	heta_i = 	heta_r$$

Question 9

Which type of mirror is shown in the second image, and what kind of image does it always produce?

Accepted Answer

Convex mirror; always produces a virtual, upright image.

Question 10

A person is nearsighted. Based on the images of the eye, which type of lens would correct their vision and why?

Accepted Answer

A concave lens, because it diverges light to focus on the retina.

Question 11

Which part of the eye is responsible for controlling the amount of light that enters?

Accepted Answer

Iris

Question 12

If a mutation occurs in the DNA sequence of a gene, which of the following outcomes is NOT possible?

Accepted Answer

The mutation is always fatal.

Question 13

Which of the following best describes codominance?

Accepted Answer

Both alleles are fully and separately expressed in the phenotype.

Question 14

A scientist uses a Punnett Square to predict the offspring of two heterozygous (Rr) pea plants. What is the expected phenotypic ratio for a dominant trait?

Accepted Answer

3:1 (75% dominant, 25% recessive)

Question 15

Which of the following is an example of polygenic inheritance?

Accepted Answer

Eye color

Question 16

Which part of the eye is responsible for focusing light onto the retina?

Accepted Answer

Lens

Question 17

A person is colorblind due to a mutation affecting cone cells. Which part of the eye is directly impacted?

Accepted Answer

Retina

Question 18

Which of the following best explains why a prism creates a rainbow from white light?

Accepted Answer

The prism refracts each wavelength of light by a different amount.

Question 19

Which of the following is NOT a concern related to genetic engineering?

Accepted Answer

It guarantees increased biodiversity.

Question 20

Which of the following best describes the difference between transparent, translucent, and opaque materials?

Accepted Answer

Transparent materials transmit all light, translucent materials transmit some light, opaque materials transmit no light.

Cell Biology Study Notes: Genetics, Inheritance, and Cell Division

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