Question

chromosomes

directions complete the chart. use it to show how each pair of items
is alike and different.

	similarities	differences

| gregor mendel/
thomas morgan | 3. | 4. |
| human sex cells/
other human cells | 5. | 6. |
| human egg cells/
human sperm cells | 7. | 8. |
| sex-linked traits/
other traits of an organism | 9. | 10. |

directions define each term.

1. gamete
2. zygote
3. carrier
4. x chromosome
5. y chromosome

eags publishing. permission is granted to reproduce for classroom use only.
biology

Explanation:

Part 1: Completing the Chart (Similarities and Differences)

1. Meiosis/Mitosis

• Similarities: Both are types of cell division that involve the replication of genetic material (DNA) before division. Both use spindle fibers to separate chromosomes.
• Differences: Mitosis produces 2 diploid (2n) daughter cells identical to the parent; Meiosis produces 4 haploid (n) daughter cells (gametes) with genetic variation (crossing over, independent assortment). Mitosis is for growth/repair; Meiosis is for sexual reproduction.

2. Gregor Mendel/Thomas Morgan

• Similarities: Both contributed to the study of genetics. Mendel (pea plants) and Morgan (fruit flies) used experimental breeding to study inheritance patterns. Both discovered fundamental principles of heredity.
• Differences: Mendel studied dominant/recessive traits and independent assortment (Mendelian genetics); Morgan discovered sex-linked inheritance and confirmed chromosomes as the carrier of genes. Mendel worked with plants; Morgan with animals.

3. Human Sex Cells/Other Human Cells

• Similarities: Both are human cells with a cell membrane, cytoplasm, and a nucleus (though sex cells have half the chromosomes). Both contain DNA.
• Differences: Sex cells (gametes: sperm/egg) are haploid (23 chromosomes); other human cells (somatic) are diploid (46 chromosomes). Sex cells are for reproduction; somatic cells for growth/function.

4. Human Egg Cells/Human Sperm Cells

• Similarities: Both are haploid (23 chromosomes) gametes for sexual reproduction. Both fuse during fertilization to form a zygote.
• Differences: Egg cells (ova) are large, non-motile, and carry most of the cytoplasm/organelles for the zygote; Sperm cells are small, motile (with a tail), and contribute little cytoplasm.

5. Sex - linked Traits/Other Traits of an Organism

• Similarities: Both are inherited traits controlled by genes. Both follow basic Mendelian principles of inheritance (dominance, segregation) unless linked to sex chromosomes.
• Differences: Sex - linked traits are controlled by genes on the X or Y chromosome (e.g., color blindness, hemophilia); other traits are on autosomes (non - sex chromosomes). Sex - linked traits show different inheritance patterns in males/females (e.g., males inherit X - linked traits from their mother, Y - linked from father); autosomal traits are inherited equally by males/females.

Part 2: Defining Terms

11. Gamete

A gamete is a haploid (n) reproductive cell (sperm in males, egg in females) that fuses with another gamete during fertilization to form a diploid zygote.

12. Zygote

A zygote is a diploid (2n) cell formed by the fusion of two haploid gametes (sperm and egg) during fertilization; it is the first cell of a new organism and will develop into an embryo.

13. Carrier

A carrier is an individual who has one copy of a recessive allele for a genetic disorder (and one dominant normal allele) and does not show symptoms of the disorder but can pass the allele to offspring.

14. X Chromosome

The X chromosome is one of the two sex chromosomes in humans (the other is Y). It is larger, carries many genes (not just sex - determining), and is present in both males (XY) and females (XX).

15. Y Chromosome

The Y chromosome is one of the two sex chromosomes in humans, smaller than the X, carries genes (including the SRY gene for male development), and is only present in males (XY).

Answer:

s (Chart Completion - Key Points)

Pair	Similarities	Differences
Mendel/Morgan	Studied genetics via breeding; discovered heredity principles.	Mendel: plants, Mendelian traits; Morgan: fruit flies, sex - linked traits.
Sex Cells/Other Cells	Human cells with DNA; cell membrane/cytoplasm.	Sex cells: haploid (23); others: diploid (46). Sex cells: reproduction; others: growth/function.
Egg/Sperm Cells	Haploid gametes; fuse to form zygote.	Egg: large, non - motile, cytoplasmic; Sperm: small, motile, little cytoplasm.
Sex - linked/Other Traits	Inherited, controlled by genes.	Sex - linked: on X/Y; others: on autosomes. Sex - linked: sex - dependent inheritance; others: equal.

Term Definitions (Final Answers)

1. Gamete: Haploid reproductive cell (sperm/egg) for fertilization.
2. Zygote: Diploid cell from sperm - egg fusion, first of new organism.
3. Carrier: Individual with one recessive allele for a disorder (no symptoms, passes allele).
4. X Chromosome: Sex chromosome (XX in females, XY in males), carries many genes.
5. Y Chromosome: Sex chromosome (XY in males), carries male - determining genes.