1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Luba_88 [7]
3 years ago
8

Why do relatively few fetuses with chromosomal trisomies survive to birth?

Biology
1 answer:
ki77a [65]3 years ago
5 0
A trisomy is a condition in which there is one more chromosome than normal, meaning that in humans there are three replicates of a particular chromosome, instead of the normal pair of two. In most of the times, trisomies lead to miscarriages. In rare cases, it can lead to live birth but it will be associated with shortened life expectancy and disabilities. In humans, autosomal chromosomes are essential to life and an abnormal increase of their number can be lethal. The fetus will not be able to develop properly and this will lead to a miscarriage.
You might be interested in
A client reports difficulty falling asleep. what are nursing interventions to promote sleep?
stepladder [879]
<span>The client should speak with their physician to determine the best course of action before attempting any treatment. A change in diet or exercise may help to solve the issue, or a prescribed sleep aid may be required if the case is that severe.</span>
4 0
3 years ago
How might patterns of inheritance influence taste preferences
charle [14.2K]
Humans have about 35 receptors to detect sweet, salty, bitter, sour, umami and fat tastes. ... Any of these genetic variants may change the shape of the receptor (the lock) and result in a difference in perception of taste or aroma between people
7 0
2 years ago
You have crossed two Mexican hairless dogs, and the offspring are 1/3 hairy and 2/3 hairless. Given this phenotypic ratio, draw
DaniilM [7]

Answer:

- Punnett square:

             H                  -                h

H   -  HH (lethal)                Hh (hairless)

h   -  Hh (hairless)             hh (hairy)

- Cross: Hh × Hh (all genotypes are Hh)

- Genotypes of the P1 dogs: heterozygous (Hh)

- Genotypes of the F1 dogs: 1/3 hh; 2/3 Hh

- It is not possible to design a cross where all offspring are hairless because the H allele for hairless is lethal in homo-zygous condition (the maximum possible is 2/3 hairless individuals)

Explanation:

As you can see in the Punnett square above, the 1:2 ratio (i.e., 1/3 hairy and 2/3 hairless) is indicative that the hair phenotype is a single (monogenic) trait associated with a lethal allele (H allele). In this case, it should be impossible to design a true-breeding cross because the homo-zygous HH genotype is lethal. ​Alleles that cause the death of an organism are known as lethal alleles (in this case, the H allele). A recessive lethal allele is only lethal in the homo-zygous individuals, thereby heterozygous individuals survive and they may exhibit a normal/altered (non-lethal) phenotype.

4 0
3 years ago
Tysm!! Also if can please hurry- Thank You So Much!! Sorry if it’s not Biology?.. hurry please I have 2 mins!!
gladu [14]
I think it’s b and a the last opciones yes
8 0
2 years ago
Genes code for the production of ________ which can control traits.
lara [203]

Answer:

protein

Most genes contain the information needed to make functional molecules called proteins. (A few genes produce regulatory molecules that help the cell assemble proteins.) The journey from gene to protein is complex and tightly controlled within each cell.

7 0
2 years ago
Read 2 more answers
Other questions:
  • Which of the following can occur in a polar cell? Select all that apply.
    7·1 answer
  • How to use the word specialist in a biology sentence ?
    10·1 answer
  • 1.Which organism is an animal?
    6·1 answer
  • True or false please help
    15·2 answers
  • NO NEED TO ANSWER ALL! WOULD BE HELPFUL THOUGH :)
    12·1 answer
  • When a solute is able to diffuse through a membrane?
    12·1 answer
  • What determines whether an igneous rock will have large crystals or small crystals?
    11·1 answer
  • Some species of hover flies resemble wasps in body coloring and shape.
    13·1 answer
  • Up to this point, did you notice any differences between the development of male and female gametes?
    14·1 answer
  • Fill in the blank below with the word that best completes the sentence.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!