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2021-05-14

What are the general causes of chromosomal diseases?

What are the general causes of chromosomal diseases?

Chromosome abnormalities often happen due to one or more of these:

  • Errors during dividing of sex cells (meiosis)
  • Errors during dividing of other cells (mitosis)
  • Exposure to substances that cause birth defects (teratogens)

Which of the following are types of hereditary disorder?

They are not passed down from parent to child, as is the case with a hereditary disease.

  • Sickle Cell Disease. Sickle cell disease is a hereditary disease caused by mutations in one of the genes that encode the hemoglobin protein.
  • Cystic Fibrosis.
  • Tay-Sachs.
  • Hemophilia.
  • Huntington’s Disease.
  • Muscular Dystrophy.

What do dominant traits include?

Baldness is a dominant trait. Having a widow’s peak (a V-shaped hairline) is dominant over having a straight hairline. Freckles, cleft chin and dimples are all examples of a dominant trait. Having almond-shaped eyes is a dominant trait whereas having round eyes is a feature controlled by recessive alleles.

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Will a boy be taller than his mother?

Height in humans is about 70 per cent genetic and 30 per cent environmental, but there are many different genes that all contribute to your final height. If a mother and father are the same height, their daughters will be roughly the same height, but their sons will be taller.

Can you be shorter than your mother?

It’s certainly not common, but it’s not abnormal per se. Genetics are random so an adult man shorter than his mother is not unheard of. If the father is shorter then the mother the chances of the son being shorter then the mother is pretty high if he takes after the dad height.

Can a tall child end up short?

If you go through puberty later, you will likely reach adult height at a later age. That’s why some of the girls who are the tallest in 5th grade end up being shorter than everyone else in high school. Some of the boys who enter high school under 5 feet end up growing a foot by the time they graduate.

At what age does a girl stops growing?

Girls grow at a quick pace throughout infancy and childhood. When they reach puberty, growth increases dramatically again. Girls usually stop growing and reach adult height by 14 or 15 years old, or a couple years after menstruation begins.

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Does height come from grandparents?

You can predict the child to be tall if parents, grandparents and other relatives are tall. Height depends on many factors such as genetics, nutrition, environment and health. Its true that height in determined by genetic factors, but also nutrition can play a major role in this.

How much of height is genetic?

Scientists estimate that about 80 percent of an individual’s height is determined by the DNA sequence variants they have inherited, but which genes these variants are in and what they do to affect height are only partially understood.