NEET Biology Genetics : Multiple Choice Previous Years Questions MCQs 5 | Summary and Q&A

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March 31, 2017
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NEET Biology Genetics : Multiple Choice Previous Years Questions MCQs 5

TL;DR

This video explains the basics of genetics, including heterozygous and homozygous genotypes, and discusses how chromosomal disorders like Down syndrome are inherited.

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Key Insights

  • ❓ Autosomal genes are not related to the sex chromosomes and can be heterozygous or homozygous.
  • ☺️ Hemophilia is a sex-linked disorder that affects the X chromosome.
  • ©️ Down syndrome is a chromosomal disorder caused by an extra copy of chromosome 21.
  • 👪 The likelihood of passing on Down syndrome is not affected by the gender of the parent.

Transcript

hello friends this video on need genetics is brought to you by a vampire calm no more fear from exam question number 14 a male human is heterozygous for autosomal genes a and B and is also homozygous for hemophilic G H what proportion of those forms will be a being H okay so in this case let us try to first find out the genotype of this human being... Read More

Questions & Answers

Q: What is the genotype of the male human in the video?

The genotype of the male is AB, DH.

Q: How many possible gametes can be produced from this genotype?

There are eight possible gametes that can be produced from this genotype.

Q: What are the possible combinations of genes in these gametes?

The possible combinations of genes in the gametes are ABH, ABY, ADH, ADY, aBH, aBY, aDH, and aDY.

Q: What proportion of these gametes will have the ABH combination?

One-eighth of the gametes, or 12.5%, will have the ABH combination.

Q: How is Down syndrome inherited?

Down syndrome is not a Mendelian disorder. It is caused by an extra copy of chromosome 21 and can be inherited if one of the parents has the extra copy.

Q: Does the gender of the parent affect the likelihood of passing on Down syndrome?

No, the gender of the parent does not affect the likelihood of passing on Down syndrome. It can be passed on regardless of whether the mother or father has the extra copy of chromosome 21.

Q: How many autosomes does a normal person have?

A normal person has 44 autosomes.

Q: What are the possible outcomes if an affected mother and a normal father have a child?

There is a 50% chance that the child will be affected by Down syndrome and a 50% chance that the child will be normal.

Summary & Key Takeaways

  • The video discusses the genotype of a male human who is heterozygous for autosomal genes A and B and homozygous for the hemophilia gene H.

  • It explains how to determine the possible gametes and the proportion of gametes that will be ABH.

  • The video also explains how Down syndrome, a chromosomal disorder caused by an extra copy of chromosome 21, is inherited.

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