Your professor (Sam) and his wife (Becca) both have normal color vision, but their son is colorblind. What do you know about Sam's and Becca's genotypes?
A. Sam = c+c+ Becca = c+c+
B. Sam = c+c Becca = c+c
C. Sam=cY Becca=cc
D. Sam = c+Y Becca = c+c

Question

04-12-2019
Biology

contestada

Your professor (Sam) and his wife (Becca) both have normal color vision, but their son is colorblind. What do you know about Sam's and Becca's genotypes?
A. Sam = c+c+ Becca = c+c+
B. Sam = c+c Becca = c+c
C. Sam=cY Becca=cc
D. Sam = c+Y Becca = c+c

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pedrocarratore pedrocarratore · Answer 1 · 2019-12-04T04:45:50+01:00

Answer:

D. Sam = c+Y Becca = c+c

Explanation:

Colorblindness is a X-linked trait. Since Sam is a male and not colorblind, there's only one possible genotype he could have which is:

[tex]Sam:\ X^{c+}Y[/tex]

Being c+ the dominant allele for not being colorblind while c is the recessive allele associated with colorblindness.

As for Becca, in order for her to not have colorblindness but her son do, she needs to have a heterozygous genotype and pass down the recessive Y allele to her son. Becca's genotype is:

[tex]Becca:\ X^{c+}X^{c}[/tex]

Therefore, the answer is D. Sam = c+Y Becca = c+c

Your professor (Sam) and his wife (Becca) both have normal color vision, but their son is colorblind. What do you know about Sam's and Becca's genotypes? A. Sam = c+c+ Becca = c+c+ B. Sam = c+c Becca = c+c C. Sam=cY Becca=cc D. Sam = c+Y Becca = c+c

Respuesta :

Otras preguntas

Your professor (Sam) and his wife (Becca) both have normal color vision, but their son is colorblind. What do you know about Sam's and Becca's genotypes?
A. Sam = c+c+ Becca = c+c+
B. Sam = c+c Becca = c+c
C. Sam=cY Becca=cc
D. Sam = c+Y Becca = c+c