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olga nikolaevna [1]
3 years ago
15

Which human cells never have 23 pairs of chromosomes?. . A. blood cells. . B. nerve cells. . C. mature sex cells. . D. mutant ce

lls
Biology
2 answers:
Burka [1]3 years ago
5 0
Mature germ cells or we can say mature sex cell ( sperm or egg ) have half number of chromosomes in there cell
Solnce55 [7]3 years ago
4 0
<h3><u>Answer;</u></h3>

C. Mature sex cells

<h3><u>Explanation;</u></h3>
  • <u><em>Human somatic cells or body cells are diploid such that they contain two sets of 23 chromosomes which gives a total of 23 chromosomes.</em></u>
  • Examples <em><u>of somatic cells in the body that are diploid include, epithelial cells, somatic cells, liver cells, blood cells, nerve cells, etc.</u></em>
  • However, <u><em>mature sex cells are haploid, which means they have one set of 23 chromosomes which means they have 23 chromosomes.</em></u> Sex cells are the results of meiosis type of cell division in which a diploid cell divides to form four daughter cells that are haploid.
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4 years ago
In rabbits, short hair(S) is dominant over long hair(s). What genotype and phenotype ratios are expected from a cross between tw
SOVA2 [1]

Answer:

Genotype                  Phenotype                      

SS                 1/4          Short hair         3/4

Ss                 2/4         Short hair          3/4

ss                  1/4          Long hair          1/4

Explanation:

Both are heterozygous for the trait so we can expect that the cross would be:

Ss x Ss

    S     s

S  SS   Ss

s   Ss   ss

So the resulting off-spring would have the following genotype and phenotype:

1 out of 4 will have a genotype of SS.

2 out of 4 or half will have a genotype of Ss.

1 out of 4 will have a genotype of ss.

But because short hair is dominant the phenotype ratios would differ because Ss and SS would express short hair, so we add up their ration:

Short hair: 1/4 + 2/4 = 3/4

Long hair:  1/4

So in summary:

Genotype                  Phenotype                      

SS                 1/4          Short hair         3/4

Ss                 2/4         Short hair        

ss                  1/4          Long hair          1/4

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