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1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
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18. Biotechnology2h 58m
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26. Prokaryotes4h 59m
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28. Plants1h 22m
29. Fungi36m
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  19m
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  17m
30. Overview of Animals34m
- Overview of Animals
  34m
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33. Plant Anatomy1h 3m
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  1h 2m
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  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
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  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
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- Digestion
  1h 3m
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  7m
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41. Immune System1h 12m
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- Osmoregulation and Excretion
  50m
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- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
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  1h 8m
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  46m
46. Sensory Systems46m
- Sensory System
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47. Muscle Systems23m
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  23m
48. Ecology3h 11m
49. Animal Behavior28m
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  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

13. Mendelian Genetics

Punnett Squares

General Biology

13. Mendelian Genetics

Punnett Squares

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1:52 minutes

Problem 8c

Textbook Question

In garden peas, yellow seeds (Y) are dominant to green seeds (y), and inflated pods (I) are dominant to constricted pods (i). Suppose you have crossed YYII parents with yyii parents. Draw the F2 Punnett square. Based on this Punnett square, predict the expected phenotype(s) in the F2 generation and the expected frequency of each phenotype.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Mendelian Genetics

Mendelian genetics is the study of how traits are inherited through generations based on the principles established by Gregor Mendel. It involves understanding dominant and recessive alleles, where dominant traits mask the expression of recessive ones. In this case, yellow seeds (Y) and inflated pods (I) are dominant traits, while green seeds (y) and constricted pods (i) are recessive.

Punnett Square

A Punnett square is a diagram used to predict the genotypic and phenotypic outcomes of a genetic cross. It organizes the possible combinations of alleles from each parent, allowing for the visualization of potential offspring traits. In this scenario, the F1 generation from crossing YYII and yyii will all be YyIi, and the F2 generation can be analyzed by crossing these F1 individuals.

Phenotypic Ratios

Phenotypic ratios represent the relative frequencies of different phenotypes in the offspring resulting from a genetic cross. After constructing the F2 Punnett square, one can determine the expected phenotypes and their ratios, such as the proportion of yellow vs. green seeds and inflated vs. constricted pods. This analysis helps predict how traits will be expressed in the next generation.

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Related Practice

Open Question

A female dog with black fur (Ff) mates with a male dog that also has black fur (Ff). Determine the possible genotypes and phenotypes of their puppies using a Punnett Square. Black fur (F) is dominant to grey fur (f).

a) # of possible Genotypes:

FF: ________

Ff: ________

ff: _________

b) % of possible Phenotypes:

Black fur: __________

Grey fur: ___________

In garden peas, yellow seeds (Y) are dominant to green seeds (y), and inflated pods (I) are dominant to constricted pods (i). Suppose you have crossed YYII parents with yyii parents. List the genotype(s) of gametes produced by F1 individuals.

873

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Textbook Question

In garden peas, yellow seeds (Y) are dominant to green seeds (y), and inflated pods (I) are dominant to constricted pods (i). Suppose you have crossed YYII parents with yyii parents. Draw the F2 Punnett square. Based on this Punnett square, predict the expected phenotype(s) in the F2 generation and the expected frequency of each phenotype.

1220

views

Textbook Question

In garden peas, yellow seeds (Y) are dominant to green seeds (y), and inflated pods (I) are dominant to constricted pods (i). Suppose you have crossed YYII parents with yyii parents. Draw the F1 Punnett square and predict the expected F1 phenotype(s).

989

views

Textbook Question

In garden peas, yellow seeds (Y) are dominant to green seeds (y), and inflated pods (I) are dominant to constricted pods (i). Suppose you have crossed YYII parents with yyii parents. Draw the F1 Punnett square and predict the expected F1 phenotype(s).

840

views

Textbook Question

In tigers, a recessive allele of a particular gene causes both an absence of fur pigmentation (a white tiger) and a cross-eyed condition. If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring will be cross-eyed? What percentage of cross-eyed tigers will be white?

1952

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Multiple Choice

In a monohybrid cross using a Punnett square, what is the expected genotypic ratio of the offspring when both parents are heterozygous for a trait?

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Multiple Choice

In a dihybrid cross involving two heterozygous parents (AaBb x AaBb), what phenotypes would you predict in the F2 generation?

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