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blagie [28]
3 years ago
9

What does single” chromosomes mean?

Biology
1 answer:
Ira Lisetskai [31]3 years ago
6 0

Answer:

It is the nucleus of each cell where the DNA molecule is packed into thread like structure which is called chromosome.

Explanation:

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A woman who is a carrier for colour blindness (X-linked recessive) has children with a man who has normal colour vision. A. What
viva [34]

Answer:

Explanation:

The Genotype of the  woman is XCbXN

The man XNY

Since the allele for the color blindness is carried on one of the X -chromosomes of the  carrier mother, then  the male children will be color blind or carrier deopending on the defective gene they inherited. Since they will receive the defective or normal  allele from the  mothers,but the female will carriers or normal because they will inherit either defective allele or normal allele from the mother,but normal  X allele from the father.

Assuming the colorbind gene was inherited by One of the boys, and the girls take the defective genes

1. XNY vs XCbXN.Then the one of the  boys will be colorblind  and the one of  girls will be carriers. XNXCb, XNXN, XCbY,XNY  50 %

2.If the two boys take the effective genes from the mothers. and none of the girls take the defective alelle

Then the two boys will be colorblind and the girls will be carrries XcbY,XcbY and XNXN XNXN.(normal girls).

The proportions that will be  the females  since the girls can only take the defective allele from one of the normal and defective allele from the mother. Assuming the girls  take the defective allele from the mothers and take normal from the father,they will all  be carriers,since the X of the father is normal.

They can not have a color blind girl.Since the father is normal It takes two colorblind X-chromosome to give a girl.

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3 years ago
Can someone explain? thank you
kotykmax [81]

Answer:

Abiotic factors can all be measured to show the living conditions in an ecosystem.

Light meters can be used to measure light intensity. ...

Errors can be made when measuring light intensity by accidentally shading the light meter. ...

Soil moisture and soil pH meters are also available.

Explanation:

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3 years ago
The average age at which an infant can sit unattended is approximately __________ months.
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This varies from baby to baby, but it is approximated to be the ages of 4 to 7 months.
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Two organisms that have sexual and two that have asexual reproduction?
Ipatiy [6.2K]

Answer: Sexual reproduction: rabbits and dolphins.

Asexual reproduction: Strawberry and potato.

Explanation:

  • Sexual reproduction is carried out with the participation of germ cells from two stem organisms - female and male, which transfer the properties of the inherited material to the new plant. The main characteristic of sexual reproduction is the division of the relative fusion of male and female sex cells. The end product of this relationship is the creation of an organism that contains the genetic information of both parents.
  • Asexual reproduction is a habit that produces an organism identical to the parent organism, and we call this product clones. This form of reproduction does not involve the germ cells and may occur by division or budding. Many types of plants reproduce in this way. So the strawberries are propagated by boils, and the potatoes are buds from the tub
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