In diploid sexually reproducing organisms the diploid number of chromosomes is a

Question

In diploid sexually reproducing organisms the diploid number of chromosomes is a) the number of chromosomes in a typical somatic cell (i.e. a liver cell)   b) half the number of chromosomes in a somatic cell c) the number of pairs of homologous chromosomes in a somatic cell d) the number of chromosomes in a gamete e) the number of pairs of homologous chromosomes in a gamete.

Ques. 2-4: In a species of monkey the diploid chromosome number is 48.

   2.      The number of pairs of homologous chromosomes in a typical somatic cell is   

            a) 12 b) 24 c) 48 d) 72 e) 96.

   3.      The number of chromosomes in a single cell after mitosis would be a) 12 b) 24 c) 48 d) 72 e) 96.

   4.      The number of chromatids in a single cell after the first division of meiosis would be

            a) 12 b) 24 c) 48 d) 72 e) 96.

   5.      In meiosis, chromosome replication occurs a) in the G1 stage of interphase I   b) in the S stage of interphase I c) in the S phase of interphase II d) a& c e) b & c.    

   6.      Ignoring rare mutations, sister chromatids a) differ in the alleles they carry for most genes b) differ in the alleles they carry in heterozygotes but not in homozygotes c) carry the same allele for each gene

            d) carry the same allele for each gene and always differ from the allele on their homologous chromosome.

Explanation / Answer

In diploid sexually reproducing organisms the diploid number of chromosomes is
The answer is a) the number of chromosomes in a typical somatic cell (i.e. a liver cell)  

In a species of monkey the diploid chromosome number is 48.
2. The number of pairs of homologous chromosomes in a typical somatic cell is
b) 24 - Diploid means they have a pair of same chromosomes (homologous chromosomes), during meiosis, the homologous chromosome forms one pair so, the no of homologous paris = 48/2 = 24

3. The number of chromosomes in a single cell after mitosis would be
c) 48 - As the chromatid segregation occurs in the mitosis, the chrmosome number remains constant. So, the answer is 48.

4. The number of chromatids in a single cell after the first division of meiosis would be
a) 12 b) 24 c) 48 d) 72 e) 96.

The answer is c) 48
Because each cell after meiosis I has 24 chromosomes, as each chromosome has 2 chromatids, the answer is 48.

5. In meiosis, chromosome replication occurs

b) in the S stage of interphase I

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.