a) In a tabular form, differentiate between mitosis and meiosis.

Question

a) In a tabular form, differentiate between mitosis and meiosis.

Asked on March 28, 2026Biology

This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

Accepted Answer · 2026-03-28T00:02:19.715Z

a) In a tabular form, differentiate between mitosis and meiosis. | Feature | Mitosis | Meiosis | | :-------------------- | :------------------------------------------ | :--------------------------------------------- | | Type of cells | Somatic cells | Germ cells (for gamete formation) | | Number of divisions | One | Two (Meiosis I and Meiosis II) | | Number of daughter cells | Two | Four | | Ploidy of daughter cells | Diploid ($2n$) | Haploid ($n$) | | Genetic identity | Genetically identical to parent cell | Genetically different from parent cell | | Crossing over | Does not occur | Occurs during Prophase I | | Purpose | Growth, repair, asexual reproduction | Sexual reproduction (gamete formation), genetic variation | b) State the secondary sexual characteristics in human females. 1. Development of breasts. 2. Widening of hips. 3. Growth of pubic and axillary (armpit) hair. 4. Onset of menstruation (menarche). 5. Increase in body fat deposition, particularly around hips and thighs. c) Using genetic symbols and diagrams, determine the genotypes and phenotypes of the offspring of a man and a woman who both have the sickle cell trait (heterozygous). Let $\text{Hb}^{\text{A}}$ represent the allele for normal hemoglobin. Let $\text{Hb}^{\text{S}}$ represent the allele for sickle cell hemoglobin. Parents' genotypes: Both are heterozygous for the sickle cell trait, so their genotype is $\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$. Step 1: Determine the gametes produced by each parent. Each parent ($\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$) can produce two types of gametes: $\text{Hb}^{\text{A}}$ and $\text{Hb}^{\text{S}}$. Step 2: Construct a Punnett square to show the possible genotypes of the offspring. $$ \begin{array}{|c|c|c|} \hline \text{Gametes} & \text{Hb}^{\text{A}} & \text{Hb}^{\text{S}} \\ \hline \text{Hb}^{\text{A}} & \text{Hb}^{\text{A}}\text{Hb}^{\text{A}} & \text{Hb}^{\text{A}}\text{Hb}^{\text{S}} \\ \hline \text{Hb}^{\text{S}} & \text{Hb}^{\text{A}}\text{Hb}^{\text{S}} & \text{Hb}^{\text{S}}\text{Hb}^{\text{S}} \\ \hline \end{array} $$ Step 3: Determine the genotypes and phenotypes of the offspring. Genotypes: $\text{Hb}^{\text{A}}\text{Hb}^{\text{A}}$: 1 out of 4, or 25% $\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$: 2 out of 4, or 50% $\text{Hb}^{\text{S}}\text{Hb}^{\text{S}}$: 1 out of 4, or 25% Phenotypes: Normal (no sickle cell trait or disease): $\text{Hb}^{\text{A}}\text{Hb}^{\text{A}}$ - 25%* Sickle Cell Trait (carrier, generally healthy): $\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$ - 50%* Sickle Cell Anemia (affected): $\text{Hb}^{\text{S}}\text{Hb}^{\text{S}}$ - 25%*

Accepted Answer · 2026-03-28T00:02:19.715Z

a) In a tabular form, differentiate between mitosis and meiosis. | Feature | Mitosis | Meiosis | | :-------------------- | :------------------------------------------ | :--------------------------------------------- | | Type of cells | Somatic cells | Germ cells (for gamete formation) | | Number of divisions | One | Two (Meiosis I and Meiosis II) | | Number of daughter cells | Two | Four | | Ploidy of daughter cells | Diploid ($2n$) | Haploid ($n$) | | Genetic identity | Genetically identical to parent cell | Genetically different from parent cell | | Crossing over | Does not occur | Occurs during Prophase I | | Purpose | Growth, repair, asexual reproduction | Sexual reproduction (gamete formation), genetic variation | b) State the secondary sexual characteristics in human females. 1. Development of breasts. 2. Widening of hips. 3. Growth of pubic and axillary (armpit) hair. 4. Onset of menstruation (menarche). 5. Increase in body fat deposition, particularly around hips and thighs. c) Using genetic symbols and diagrams, determine the genotypes and phenotypes of the offspring of a man and a woman who both have the sickle cell trait (heterozygous). Let $\text{Hb}^{\text{A}}$ represent the allele for normal hemoglobin. Let $\text{Hb}^{\text{S}}$ represent the allele for sickle cell hemoglobin. Parents' genotypes: Both are heterozygous for the sickle cell trait, so their genotype is $\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$. Step 1: Determine the gametes produced by each parent. Each parent ($\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$) can produce two types of gametes: $\text{Hb}^{\text{A}}$ and $\text{Hb}^{\text{S}}$. Step 2: Construct a Punnett square to show the possible genotypes of the offspring. $$ \begin{array}{|c|c|c|} \hline \text{Gametes} & \text{Hb}^{\text{A}} & \text{Hb}^{\text{S}} \\ \hline \text{Hb}^{\text{A}} & \text{Hb}^{\text{A}}\text{Hb}^{\text{A}} & \text{Hb}^{\text{A}}\text{Hb}^{\text{S}} \\ \hline \text{Hb}^{\text{S}} & \text{Hb}^{\text{A}}\text{Hb}^{\text{S}} & \text{Hb}^{\text{S}}\text{Hb}^{\text{S}} \\ \hline \end{array} $$ Step 3: Determine the genotypes and phenotypes of the offspring. Genotypes: $\text{Hb}^{\text{A}}\text{Hb}^{\text{A}}$: 1 out of 4, or 25% $\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$: 2 out of 4, or 50% $\text{Hb}^{\text{S}}\text{Hb}^{\text{S}}$: 1 out of 4, or 25% Phenotypes: Normal (no sickle cell trait or disease): $\text{Hb}^{\text{A}}\text{Hb}^{\text{A}}$ - 25%* Sickle Cell Trait (carrier, generally healthy): $\text{Hb}^{\text{A}}\text{Hb}^{\text{S}}$ - 50%* Sickle Cell Anemia (affected): $\text{Hb}^{\text{S}}\text{Hb}^{\text{S}}$ - 25%*