Question

1. Haploid cells:

1. Are representative of all cells in body
2. Occur during mitosis
3. Occur during meiosis
4. Possess paired chromosomes

2. Disease hemophilia results from:

1. Dominant gene on X chromosome in males
2. Recessive gene on Y chromosome in males
3. Recessive gene on X chromosome in males
4. Dominant gene on Y chromosome

3. The human genome consists of:

1. DNA, most of which encodes for proteins
2. DNA, most of which does not encode for proteins
3. Proteins, which encodes DNA
4. RNA, most of which does not encode proteins

4. A gene is:

1. Sequence of DNA nucleotides coding for one protein
2. Sequence of amino acids
3. A chromosome
4. Sequence of RNA nucleotides coding for one protein

5. Genetics is study of:

1. Sperm & egg
2. Effect of environment on our health
3. Inheritance
4. DNA

6. In a human zygote, the 46 chromosomes:

1. All come from sperm cell
2. Half comes from DNA & half from RNA
3. Half comes from sperm cell and half from egg cell
4. All come from egg cell

7. The two types of chromosomes are:

1. Autosomes & allosomes
2. Sex chromosomes & allosomes
3. Sex chromosomes & autosomes
4. X & Y chromosomes

8. In an autosomal inheritance where dominant gene is expressed, all offspring will show dominant homozygous if:

1. Trait is sex-linked
2. Both parents are dominant homozygous
3. Both parents are dominant heterozygous
4. One of the parent is dominant heterozygous

9. In a sex-linked hemophilia disease due to a recessive gene, a mating of homozygous female non-hemophilia  with hemophilia male  will result in:

1. 100% females with hemophilia
2. 100% males will not be hemophilia
3. 50% males will be hemophilia
4. None of offspring will be hemophilia

10. An individual with same gene in an allele is said to be:

1. Heterozygous
2. Homozygous
3. Haploid
4. Hemizygous

Answer 1

1. Answer :-(c) occur during meiosis

Explanation:- meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four haploid gamete cells.

2. Answer:- (c) recessive gene on X chromosome on males

Explanation:- hemophilia is a X linked inherited disease present in males if they inherit affected X chromosome that has a mutation in either the factor vIII or factor IX gene.

3. Answer:- (a) most of which encodes for proteins

Explanation:- a gene is a string of DNA that encodes for information necessary to make protein, which then goes on to perform functions within cells.

4. Answer:- (c) inheritance

Explanation:- genetics is a study of how heritable traits are transmitted from parents to offspring.

5. Answer:- (c) half comes from sperm cell and half comes from egg cell

Explanation:- in human fertilization, a released ovum( haploid secondary oocyte with replicate chromosome copies) fuses with haploid sperm cell to form diploid call called zygote.

6. Answer:- (c) sex chromosome and autosome

Explanation:- two types of chromosomes are present in the body - first, autosomes that regulates the somatic characters of the body. Secondly, sex chromosome that determines the sex of the body and is responsible for sex linked traits.

7. Answer:- (b) both parents are dominant homozygous

Explanation:- when both the parents carries two copies of the same dominant allele(homozygous) , their all children will also have two copies of the same allele and they all will be homozygous.

8. Answer:- (d) none of the offsprings will have hemophilia

Explanation:- hemophilia is a X linked recessive disease in males and female is only carrier of this disease. In this question, homozygous female is non-hemophilic , so she will not transmit the disease. Only male transmits the disease to their female offspring and the female offspring will be only carrier. The male offspring will be neither hemophilic nor carry the disease. Thus, none of the child will have hemophilia.

9. Answer:- (b) homozygous