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dmitriy555 [2]
3 years ago
7

Sex chromosomes are:

Biology
1 answer:
LenaWriter [7]3 years ago
6 0

Answer:

D. the 23rd pair of chromosomes

Explanation:

Humans have a total of 23 pairs of chromosomes. Out of a total of 23 pairs, 22 pairs are autosomes. Autosomes are the chromosomes that carry the genes for all the genetic traits but are not involved in the sex determination of the individuals.

The 23rd pair of chromosomes in humans is of sex chromosomes as these chromosomes carry the genes to regulate the gender of the individuals. A human female has two copies of the X chromosome as sex chromosomes while human males have one X and one Y chromosome as their sex chromosomes. The Y chromosome carries "SRY" gene that codes for testes determining factor and regulates the development of testes in the embryo.

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explain how complete dominance, co dominance, incomplete dominance, and sex linked traits are inherited and expressed differentl
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<span> COMPLETE DOMINANCE:
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<span>Mendel concluded that some alleles are dominant and others are recessive. When one dominant allele is present, it's enough to make the recessive allele unexpressed (this is what happens in heterozygous individuals). In other words, it 'hides' or masks the recessive allele.

CO-DOMINANCE:

-a condition in which both alleles are dominant.
</span>
There are alleles that have the capacity of dominating at the same time, and when an organism is heterozygotic, both alleles are expressed.
For example, a white chicken(WW) crossed with a black chicken (BB):  100% of the offspring being WB. With this genotype, they have black feathers and white feathers.
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INCOMPLETE DOMINANCE:
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plant 1: RR -red
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By crossing this plants we will obtain 100%  of the offspring with a color mix: pink.(genotype: Rr)
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SEX LINKED TRAITS

Sex chromosomes contain genes that determine the sex of a person. Two X chromosomes result in a female and one X plus a Y result in a male.

In those chromosomes, there are genes specific for each gender, and in those chromosomes, there are genes that code for certain traits- the sex-linked traits.
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