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
Dominik [7]
3 years ago
8

In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotyp

ic ratio (homozygous dominant:heterozygous:homozygous recessive) would you expect to observe in the offspring?
Biology
1 answer:
Nuetrik [128]3 years ago
3 0

Answer:

1:2:0

Explanation:

If two recessive lethal alleles come together, they will be expressed and lead to the offspring's death. Let the dominant allele be S and the recessive allele be s. Here, the two individuals are heterozygous for it. So when they mate:

    S     s

S  SS  Ss

s   Ss   ss

1/4 have homozygous fominant genotype (SS), 2/4 have heterozygous genotype (Ss) and 1/4 have homozygous recessive (ss) genotype. Since 1/4 offspring have ss genotype, they will die. Hence, the usual 1:2:1 ratio has been modified here to only 1:2:0

You might be interested in
If a mammal gives birth to live animals, how is a monotreme a mammal if it lays eggs? This has been confusing me for the past 30
natka813 [3]

Answer:

In some ways, monotremes are very primitive for mammals because, like reptiles and birds, they lay eggs rather than having live birth. In a number of other respects, monotremes are rather derived, having highly modified snouts or beaks, and modern adult monotremes have no teeth.

8 0
3 years ago
List at least four reasons why it is difficult to send manned space flights to parts
icang [17]
1 you run out of fuel 2 it takes a long time 3 it’s hard to get back 4 the conditions are constantly changing making it harder to predict what could happen. Look at Apollo 12 as a example
3 0
2 years ago
Photosynthesis, experiment to verify that sunlight is necessary for photosynthesis<br>​
agasfer [191]

Answer:

Experiment to show that sunlight is necessary for photosynthesis - definition. Take a plant with destarched leaf. Leaf is partially covered with black paper on which a design is cut. Expose this plant to sunlight for few hours and perform a starch test with iodine solution.

Explanation:

I tried kiddo

8 0
3 years ago
What type of model did Copernicus propose for the solar system?
Varvara68 [4.7K]
I believe it is D) heliocentric !
3 0
3 years ago
People with diseases that result in the malabsorption of which nutrient are at risk for a vitamin d deficiency?
grigory [225]

Inadequate dietary vitamin D or its deficiency leads to malabsorption of calcium. Nutritional disorder leads to the rare disease rickets, which causes bones to become soft and bend in children. In adults, vitamin D deficiency leads to osteomalacia, which causes weak bones, bone pain and muscle weakness.

The body needs vitamin D to properly absorb calcium and phosphorus from the diet. However, keeping the right quantities of calcium and phosphorus in bones is challenging when vitamin D levels are low.

The two sources of vitamin D are-

  • Natural sunlight
  • Foods such as fish oil, Egg yolk and fatty fishes like salmon and mackerel

There are other disease conditions which lead to poor absorption of vitamin D-

  • Inflammatory bowel disease
  • Celiac diseases
  • Kidney problems

To learn more about Rickets here-

brainly.com/question/26292489

#SPJ4

6 0
2 years ago
Other questions:
  • What is the difference between the position of the surface proteins and the membrane -spanning proteins
    8·1 answer
  • Which of the following statements about genetic drift and population size is FALSE?
    7·1 answer
  • 1) What are the two parts of the nervous system?
    7·1 answer
  • Jenny would like to bring her service animal to work, a Labrador Retriever who helps her deal with severe anxiety. She is not su
    13·1 answer
  • A keystone species affects relative abundance of species in a community at
    14·1 answer
  • Why are bacteria a necessary part of the nitrogen cycle?
    11·1 answer
  • .
    5·1 answer
  • What happens during the S subphase of interphase?
    8·1 answer
  • What is an abiotic factor?<br>​
    7·2 answers
  • Reticulum
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!